Does Cannabis Increase Risk of Suicide?

By Roger Chriss, PNN Columnist

A new National Institute of Health study confirms a long-standing association between cannabis use and suicidality in younger adults.

NIH researchers looked at data from over 280,000 people aged 18 to 34 who participated in the National Survey of Drug Use and Health from 2008 to 2019. Their findings, published in JAMA Open Network, concluded that cannabis increased the risk of suicidal thoughts (ideation), planning and attempts by young adults.

“While we cannot establish that cannabis use caused the increased suicidality we observed in this study, these associations warrant further research, especially given the great burden of suicide on young adults,” Nora Volkow, MD, director of the National Institute on Drug Abuse, said in a statement.

Cannabis use is rising fast in the United States. Use more than doubled from 22 million people in 2008 to 45 million in 2019, and regular use tripled to nearly 10 million people by the end of the study. The increased use of cannabis coincided with a spike in suicides among young adults, which rose by 52% for women and 45% for men from 2008 to 2019.

NIH researchers found that daily cannabis use and a history of a major depressive episode (MDE) increased the risk of suicide, particularly for women. The prevalence of a suicide plan in the past year was 52% higher for women with MDE than for men with MDE.

But even when a young adult was not depressed, suicide ideation rose in tandem with the frequency of their cannabis use. Seven percent of those who used cannabis occasionally had suicidal thoughts, a number that rose to 9% for people who use cannabis daily and to 14% for people with cannabis use disorder.

The NIH study supports prior findings. Stanford researchers recently reported that in states that legalized recreational marijuana there was a 46% increase in self-harm injuries among 21- to 39-year-old men.

A 2020 study in the Journal of Addiction Nursing and a 2019 study in JAMA Psychiatry also found a strong association between cannabis and suicidality.

But the relationship is complex. The 2020 study looked at recreational cannabis use, while the 2019 study examined adolescent use. The new NIH study looked at national survey data over a period that started well before adult-use legalization in Colorado and Washington. It makes no distinction between medical and recreational cannabis, a distinction that could be important.

Explanations for the suicide association also vary, such as the higher potency of cannabis and increased availability of cannabis products. But these trends vary by state and over time, so more granular analysis is needed in order to tease out relationships among these factors.

More important, it is not clear at this point if cannabis use is simply associated with an underlying trend, exacerbating a growing problem, or is itself an independent risk factor. Sorting this out will be extremely difficult, because cannabis use does not occur in a vacuum and cannabis itself is a delivery system for a slew of cannabinoids whose effects and interactions are not fully understood.

Roger Chriss lives with Ehlers Danlos syndrome and is a proud member of the Ehlers-Danlos Society. Roger is a technical consultant in Washington state, where he specializes in mathematics and research. 

Medical Cannabis No Help to Lobsters

By Pat Anson, PNN Editor

Do lobsters feel pain when they’re boiled alive?

Seafood lovers, cooks, academics, animal rights activists and even governments have debated that question for years, with the general consensus being that they do. Lobsters, crabs and other crustaceans will often writhe in pain and try to escape when dropped into a pot of scalding hot water. The practice is considered so cruel that Switzerland and New Zealand made it illegal to boil a live lobster.

Some cooks try to ease the lobsters’ pain by stunning them with a jolt of electricity or putting them on ice to dull their senses before cooking them.  In 2018, a restaurant owner in Maine even blew marijuana smoke on a lobster named Roscoe, who reportedly grew so mellow he never wielded his claws as weapons again while in captivity.

We’ll never know the long-term effect of getting a lobster stoned because Roscoe was returned to the ocean as a thank you for his service. Good for him.

Which brings us to a bizarre study recently completed by scientists at the University of California San Diego and the Scripps Research Institute, who decided to replicate the Roscoe experiment in a lab.

"The 2018 minor media storm about a restaurant owner proposing to expose lobsters to cannabis smoke really was the starting point. There were several testable claims made and I realized we could test those claims. So we did," lead author Michael Taffe, PhD, an adjunct professor at Scripps Research told IFLScience.

Taffe and his colleagues purchased ten Maine lobsters at a local supermarket, fed them a last meal of frozen krill and fish flakes, and placed them in an aerated vapor chamber.

For the next 30 to 60 minutes, the lobsters were exposed to vapor rich in tetrahydrocannabinol (THC), the psychoactive ingredient in cannabis.

Afterwards, some of the lobsters were “rapidly euthanized” with a kitchen shear and dissected, while others were immersed in hot water to see how they’d react.

bioRxiv

Detectable levels of THC were found in the muscles and organs of the euthanized lobsters, so from that standpoint the experiment was a success. But the THC apparently had little effect on the remaining live lobsters, who displayed “distinct motor responses” and other signs of pain when put in hot water.   

"The effect of vapor THC on this nociceptive (pain) behavior was very minimal. Statistically supported in one case, but of very small magnitude," said Taffe.

We’ll leave it to readers to decide whether a study like this is humane, worthwhile or even makes sense. But it is worth noting that taxpayers helped pay for it.

The lobster cannabis study was supported by grants from the U.S. Public Health Service. Researchers were careful to note that federal funding was not directly used to purchase the lobsters. That money came from La Jolla Alcohol Research, a private company that is developing vapor inhalation technologies.  According to GovTribe, La Jolla Alcohol Research has received about $3 million in federal funding in recent years, most of it coming from the National Institute on Drug Abuse.

Cannabis Poisoning Calls Rise, Particularly for Children

By Pat Anson, PNN Editor

A new analysis of calls to U.S. poison control centers suggests that more regulation is needed of cannabis products to protect consumers – and children in particular — from adverse health consequences.

Researchers found a significant increase in cannabis-related calls to poison centers from 2017 to 2019, about half of them from a healthcare facility.

Most of the 28,630 calls involved someone ingesting cannabis flower or buds, but a growing number involved manufactured cannabis products such as edibles, vaporized liquids and concentrates. About a third of the calls were considered serious.

Cannabis-Related Calls to U.S. Poison Control Centers

JAMA NETWORK OPEN

Most of the calls about manufactured cannabis products involved underage children. Twenty-seven percent involved children under the age of 10 and about a third (34.5%) involved youths between 10 and 20 years of age. Edibles were involved in about two-thirds of those calls.

“Children may be at particular risk for exposure to edible products, such as cookies or candy,” wrote lead author Julia Dilley, PhD, Oregon Health Authority, in JAMA Network Open.

“Although we did not see more serious health outcomes for manufactured product exposures compared with plant products overall, most cannabis plant exposures involved polysubstance use, whereas most cases for manufactured products were for those products alone, suggesting that exposure to manufactured products alone may be relatively more likely to generate adverse events.”

Dilley and her colleagues say cannabis products are riskier for children because they may not know they are consuming THC (tetrahydrocannabinol), the psychoactive ingredient in cannabis. Even when they are labeled, research has found that the amount of THC in cannabis products is often inaccurate.

The study did not distinguish between medical and recreational cannabis. Interestingly, the rate of calls to poison centers from states where cannabis is legal was slightly higher than those where cannabis is still illegal, suggesting that legalization does not increase the level of safety.  

“Market factors may drive the industry to continue developing novel products, which could present additional health risks. Applying regulatory controls to market-driven innovations in potency and additives is key. Novice cannabis users are often advised to ‘start low, go slow’; this guidance may be equally applicable to regulating new retail cannabis markets and products,” researchers said.

Some cannabis companies are intentionally marketing their products as candy and snacks to make them more attractive to children. The Food & Wine website reports the Wrigley Company recently filed three lawsuits against cannabis manufacturers, alleging they produced THC-spiked products that resemble Wrigley candies such as Skittles, Life Savers and Starbursts   

“We take great pride in making fun treats that parents can trust giving to their children and children can enjoy safely," a Wrigley spokesperson told Reuters. "We are deeply disturbed to see our trademarked brands being used illegally to sell THC-infused products."

One cannabis company, THC Living, recently took a “snortable” cannabis candy off the market after complaints on social media. According to Leafly, the packaging and marketing of “Cannabis Bumps” were designed to make the powdered candy look like cocaine. Each package contained a hefty dose of 600mg of THC.    

Don’t Worry Be Happy: Why People Turned to Cannabis During the Pandemic

By Pat Anson, PNN Editor

Demand for medical cannabis rose significantly in the U.S. during the pandemic, according to a new study that found many Americans turned to cannabis to relieve stress and make them feel happy.

The study was conducted by Veriheal, a telemedicine company that helps connect patients with licensed marijuana doctors and dispensaries.

In reviewing a database of over 125,000 Veriheal patients from January 2020 to March 2021, researchers found that applications for medical cannabis cards spiked during waves of Covid-19 infections, and as social unrest grew over the presidential election and the murder of George Floyd.

"Medical cannabis has traditionally been viewed as an alternative treatment for relieving physical pain and chronic ailments," said Maha Haq, CEO of Cultivating Research Education and Advocacy Group (CREA), a research firm that studies psychoactive drugs like cannabis and psychedelics.  

"That most people are actually looking to the plant to ease psychological stressors, often related to external social upheaval, is an incredibly important discovery that helps medical professionals better understand evolving consumer relationships with cannabis, and from there, improve the quality of their treatment and related mental healthcare programs." 

Asked what was the primary effect they wanted to get from medical cannabis, nearly half of patients (46%) picked “Happy” and less than a third (29%) said pain relief. Other patients said they used cannabis to help them relax, sleep, feel mellow or more focused.

The chart below shows that sign-ups and appointments for cannabis consultations rose sharply during stressful periods; when there were spikes in COVID-19 infections, last summer’s Black Lives Matter protests, and the insurrection at the U.S. Capitol in January 2021.

SOURCE: VeRIHEAL

Researchers say the findings indicate that new cannabis consumers – at least during the pandemic -- were more likely to use cannabis to improve their mental and emotional health, as opposed to treating pain and other physical symptoms.  

“We found that people are seeking psychological relief in response to exogenous shocks including COVID-19 and beyond. Periods of social unrest, such as the Black Lives Matter protests and 2020 elections, can be seen as spikes in medical cannabis interest within our datasets," said Haq.

Positive Views About CBD Products

Most pain patients have favorable views about medical cannabis, according to a second, smaller survey of people being treated at pain management clinics in southern California. The findings were recently published in the Journal of Pain Research.

Researchers recruited 253 patients to participate in the survey, most of whom were on Medicaid or Medicare and had low incomes. Nearly two thirds (62%) said they had tried a CBD product in different formulations, including those containing THC.

Most CBD users said it significantly reduced their pain (59%) and allowed them to reduce or stop their use of pain medication (68%), including opioids (54%).  

CBD was particularly effective for those suffering from back pain (67%) and nerve pain (47%), and less effective for patients with fibromyalgia (21%) and migraine (33%).  

“While the familiarity with dosing was mixed and participants used a wide variety of products including products containing THC, they report that these products have helped them with many different pain-involving and neurological conditions,” wrote lead author Jan Schilling, MD, Scientific Director of Vitamed Research. “This cohort also reported that products both with and without THC have helped them to reduce overall pain medication and more specifically opioid medication.”

Most respondents believed that CBD was a good treatment option, not harmful and not addictive. About half said they would be more comfortable if their physician prescribed CBD products.

Most Older Adults Don’t Tell Doctors About Their Cannabis Use

By Pat Anson, PNN Editor

A growing number of older adults have discovered the medical benefits of cannabis – everything from pain relief to lower blood pressure. But a new study found that most older Americans aren’t telling their doctors about their cannabis use.

In an analysis of over 17,000 Americans aged 50 and older who participated in the 2018 and 2019 National Surveys on Drug Use and Health, researchers at the University of Texas at Austin found that nearly nine percent had used cannabis in the past year. Of those, less than 40% had discussed their cannabis use with a healthcare provider.

Researchers say that’s an alarming figure because the cannabis users were significantly more likely to have substance abuse and mental health problems than nonusers.  

“Only a minority of older cannabis users discussed their drug use with a healthcare professional, although medical users were more likely than nonmedical users to have done so,” said lead author Namkee Choi, PhD, Professor of Gerontology at the University of Texas at Austin.

“Given little difference in cannabis and other substance use/use disorders between nonmedical and medical users, older cannabis users, regardless of use reasons, should consult healthcare professionals about their use, and healthcare professionals should screen for cannabis and other substance use as part of routine care.”

Compared to recreational users, medical users consumed cannabis more frequently, with nearly 40% using it everyday or a few times each week. Surprisingly, less than 20% of medical users bought their cannabis from a dispensary; most obtained it from friends, family or strangers. About 95% of medical users said obtaining cannabis was fairly easy or very easy.

“The finding that a significant proportion of medical and nonmedical users obtained cannabis via private/informal sources indicates that they are likely to use cannabis and cannabis products with unknown tetrahydrocannabinol (THC) potency,” said Choi. “Given the increase in THC potency, healthcare professionals should educate older cannabis users, especially high-frequency users, on potential safety issues and adverse health effects of cannabis and cannabis products obtained from unregulated sources.”

The study findings were published in The American Journal of Drug and Alcohol Abuse.

A 2018 survey by the American Association of Retired Persons (AARP) found that most older Americans think marijuana is effective for pain relief, anxiety and nausea. Seventy percent of those surveyed say they would consider asking their healthcare provider about medical marijuana if they had a serious condition that they thought might respond to it.

A recent study published in the journal Cannabis and Cannabinoid Research found that older adults are more likely to purchase sublingual formulations of cannabis, such as edibles and tinctures, as well as products low in THC and high in CBD.

Urine Tests Show Medical Cannabis Often Mislabeled

By Pat Anson, PNN Editor

Pick up almost any canned or packaged food in a grocery store and you’ll see a lengthy list of its ingredients, right down to the amount of sodium, fat, vitamins and calories in each serving.

That kind of attention to detail – and truth in advertising -- continues to elude the cannabis industry, according to a new study that found the amount of THC and CBD listed on many medical cannabis products to be wildly inaccurate.

Researchers at Massachusetts General Hospital didn’t test the products themselves, but instead analyzed urine samples from nearly 100 patients who frequently used medical cannabis to treat their pain, anxiety, depression or insomnia. Vaping was the most common form of administration, but patients also smoked or ingested cannabis products purchased at Boston-area dispensaries.   

Laboratory testing showed no CBD metabolites in about a third of the urine samples from patients who said they used cannabis products that were mostly CBD or had equal parts THC and CBD. THC was detected in nearly 80% of those samples, including ones from patients who thought they were only ingesting CBD.

The distinction is important because THC (tetrahydrocannabinol) is the psychoactive ingredient in cannabis that can make users high, while CBD (cannabidiol) is the chemical compound believed to have health benefits.

"People are buying products they think are THC-free but in fact contain a significant amount of THC," says lead author Jodi Gilman, PhD, an investigator in the Center for Addiction Medicine in Massachusetts General’s Department of Psychiatry. "One patient reported that she took a product she thought only contained CBD, and then when driving home that day she felt intoxicated, disoriented and very scared."

About 20% of patients who used a vaporizer had no detectable levels of either THC or CBD in their urine. Researchers think that’s because some vaping devices may not heat cannabis products sufficiently for patients to inhale the active ingredients. THC was more likely to be found in patients who smoked cannabis or ingested it orally.

"A lot of questions about the content of the products and their effects remain," says Gilman. "Patients need more information about what's in these products and what effects they can expect."

The study findings, published in JAMA Network Open, are the latest to show that the actual ingredients in cannabis products vary considerably from their labels. Although 36 states and Washington DC have legalized medical cannabis, there is little consistency in labeling, regulating or testing medical cannabis, as there is for food, supplements and pharmaceutical drugs.

A 2015 study of cannabis edibles sold in California and Washington found that only 17% were labeled accurately. Over half had significantly less CBD than labeled and some had negligible amounts of THC.   

A recent study conducted by the Food and Drug Administration of 147 hemp and cannabis products found that less than half contained CBD within 20% of their label declarations.   

Harvard Study Finds Cannabis Effective for Chronic Pain

By Pat Anson, PNN Editor

Long-term use of medical cannabis may be an effective treatment for chronic pain, according to a small study by researchers at Harvard Medical School and McLean Hospital in Boston.

Thirty-seven patients suffering from arthritis, joint pain, neuropathy and other chronic pain conditions were evaluated over a six-month period while ingesting cannabis products through smoking, vaporizing, edibles, oils and other methods. All of the patients were cannabis “naive” — meaning they had never used cannabis before or had abstained from use for at least a year prior to the study.

After six months of daily treatment with cannabis, patients reported significant improvements in their pain, sleep, mood, anxiety and quality of life. Their use of opioid pain medication declined by an average of 13% and 23% after 3 and 6 months of treatment, respectively, although not to a degree that was considered significant.

A control group of 9 pain patients that did not use cannabis did not have a similar pattern of improvement in pain or other symptoms. 

“This naturalistic study of medical cannabis (MC) patients with chronic pain provides preliminary evidence that ‘real world’ MC treatment may be a viable alternative or adjunctive treatment for a least some individuals with chronic pain,” wrote lead author Staci Gruber, PhD, Associate Professor of Psychiatry at Harvard Medical School. 

“As results also revealed that individual cannabinoids appear to exert unique effects on pain and comorbid symptoms, more research is needed to potentially optimize cannabinoid-based treatments for pain.”

Gruber and her colleagues say increased exposure to tetrahydrocannabinol (THC), the psychoactive ingredient in cannabis, appeared to be closely related to improvements in pain, while increased CBD exposure was related to improvements in mood, but not pain. Many patients reduced their use of THC as the study progressed.

“Interestingly, we have found that many patients aim to achieve symptom alleviation without experiencing the intoxicating effects of THC. Therefore, it is likely that patients are able to achieve adequate pain relief using lower doses of THC over time than initially utilized,” said Gruber, who heads the Marijuana Investigations for Neuroscientific Discovery (MIND) program at McLean Hospital.

Researchers say additional studies are needed to explore how THC and CBD modulate pain and other symptoms. Their findings are published in the journal Experimental and Clinical Psychopharmacology.  

While the findings are intriguing, the small number of patients involved in this and most other cannabis studies makes it hard to draw firm conclusions.  

Last month two professional pain societies – the International Association for the Study of Pain (IASP) and the Australian and New Zealand College of Anaesthetists -- released statements saying they could not endorse the use of cannabis to treat pain because there are no large, high-quality and unbiased clinical trials of cannabis as an analgesic.

Cannabis Users Deserve Better Research

By Roger Chriss, PNN Columnist

This has been a challenging month for supporters of medical cannabis, with two professional pain societies – the Australian and New Zealand College of Anaesthetists and the International Association for the Study of Pain (IASP) both releasing statements saying they do not endorse the use of cannabis to treat pain.

IASP’s position statement came after a two-and-a-half-year review of cannabis studies by researchers at the University of Bath's Centre for Pain Research, who found little evidence to support the use of cannabis for pain control.

“Cannabis seems to attract strong opinions. If ever a field needed evidence and a rigorous scientific opinion it is this one. For many this will be an unpopular conclusion, but we need to face up to the fact that the evidence is simply lacking. Science is not about popularity but keeping people safe from false claims,” said Professor Christopher Eccleston, Director of the Centre for Pain Research

Eccleston and his colleagues published their findings in a series of 13 articles in IASP’s journal PAIN. They found that many cannabis studies had too few participants, tested a single-dose exposure in a laboratory, or the trials only lasted a couple of weeks. Such work can justify further research, but not the clinical use of a drug by patients, which requires long-term studies of safety and efficacy.

"Cannabis, cannabinoids, and cannabis-based medicines are becoming an increasingly popular alternative to manage pain. However, our review shows that there is limited evidence to support or refute their use for the management of any pain condition. The studies we found were poor quality and the evidence was of very low-certainty," said Dr. Emma Fisher of the University of Bath.

Although cannabis has been used for thousands of years for pain and other conditions, there are few good quality studies to support its use, as anesthesiologist Abdul-Ghalliq Lalkhen, MD, notes in his new book, “An Anatomy of Pain.”

“There have so far been only twelve randomized controlled trials on cannabis in the past five years, and most of these studies have indicated that cannabinoids are not effective in the management of neuropathic pain," wrote Lalkhen.

Even when cannabis studies are conducted, they often have disappointing results. Zynerba Pharmaceuticals had high hopes for developing CBD drugs and a transdermal CBD skin patch, but quietly dropped them after disappointing clinical trials.

“Zynerba’s drugs have struggled mightily in the clinic, missing key endpoints and sometimes failing to show dose-dependent responses. Plans for an epilepsy and osteoarthritis drug fell away with clinical failures in 2017. A year later, so did a patch that was meant to deliver their THC through the skin,” Jason Mast reported in Endpoints News.

The lack of good evidence was noted by the Food and Drug Administration when it recently warned two companies illegally marketing over-the-counter CBD products for pain relief:

“It’s important that consumers understand that the FDA has only approved one drug containing CBD as an ingredient. These other, unapproved, CBD products may have dangerous health impacts and side effects. We remain focused on exploring potential pathways for CBD products to be lawfully marketed while also educating the public about these outstanding questions of CBD’s safety,” said FDA Principal Deputy Commissioner Amy Abernethy, MD.

Even when high-quality, placebo controlled trials are conducted, they often fail to replicate the results of lower-quality studies. For instance, cannabis is often touted for post-traumatic stress disorder (PTSD). But a recent clinical trial of cannabis for PTSD found it worked no better than a placebo.

“No active treatment statistically outperformed placebo in this brief, preliminary trial. Additional well-controlled and adequately powered studies with cannabis suitable for FDA drug development are needed to determine whether smoked cannabis improves symptoms of PTSD,” researchers concluded.

The American Medical Association takes a similar view. “Scientifically valid and well-controlled clinical trials conducted under federal investigational new drug applications are necessary to assess the safety and effectiveness of all new drugs, including potential cannabis products for medical use,” the AMA said.

Cannabis users deserve high-quality research. And the medical community deserves respect for not endorsing cannabis before the evidence base is well established. Arguing over low-quality studies does not have the persuasive power of a high-quality clinical trial.

Roger Chriss lives with Ehlers Danlos syndrome and is a proud member of the Ehlers-Danlos Society. Roger is a technical consultant in Washington state, where he specializes in mathematics and research.

Doctors Advised Not To Prescribe Cannabis for Chronic Pain

By Pat Anson, PNN Editors

Pain management experts around the world are becoming more vocal about the growing use of medical marijuana as a treatment for chronic pain, saying there is little evidence to support the use of cannabis as an analgesic.

Today the Faculty of Pain Medicine at the Australian and New Zealand College of Anaesthetists (ANZCA) released new guidance urging doctors not to prescribe medical cannabis for patients with chronic, non-cancer pain unless they are enrolled in a clinical trial.

“Until there are results from high-quality, unbiased clinical trials which establish the effectiveness and safety of medicinal cannabis in treating chronic pain, the Faculty of Pain Medicine does not believe cannabinoid products should be prescribed,” Mick Vagg, MD, Dean of the Faculty of Pain Medicine, said in a statement.  

“We want to highlight to healthcare providers that currently available medical cannabis products are not even close at this stage to showing that they deserve a place in the management of the complex patients who suffer from ongoing pain. We believe clinicians will welcome this clear guidance.”

ANZCA is a professional society for nearly 8,000 anesthesiologists and pain management specialists in Australia and New Zealand, and sets standards for pain medicine in both countries.

Australia and New Zealand have some of the highest rates of cannabis consumption in the world. But New Zealand only allows medical cannabis for terminally ill patients, while Australia requires a prescription for cannabis that is often difficult to obtain.

About one if five Australians live with chronic pain.   

“Medical cannabis products are not even close at this stage to showing that they deserve a place in the management of the complex patients who suffer from ongoing pain.”

— Dr. Mick Vagg

“By far the most common reason for the use of medicinal cannabis in this country is chronic pain − however there is a critical lack of evidence that it provides a consistent benefit for any type of chronic non-cancer pain, especially compared to the treatments we already strive to provide in pain clinics,” Vagg said.

“The research available is either unsupportive of using cannabinoid products in chronic non-cancer pain or is of such low quality that no valid scientific conclusion can be drawn. Cannabidiol-only formulations have never been the subject of a published randomised controlled trial for chronic pain treatment, yet they are the most commonly prescribed type of cannabis product.”

Vagg also said research is lacking in how cannabinoids react with pharmaceutical drugs, particularly in relation to their sedative and psychiatric side effects.

‘Hypothesis’ of Analgesia

ANZCA’s new guidance came just days after the International Association for the Study of Pain (IASP) released a position statement saying it could not endorse the use of cannabinoids to treat pain. IASP said there were preliminary studies supporting the “hypothesis of cannabinoid analgesia,” but not enough to overcome the lack of evidence on the safety and efficacy of cannabinoids.

“While IASP cannot endorse the general use of cannabinoids for treatment of pain at this time, we do not wish to dismiss the lived experiences of people with pain who have found benefit from their use,” said Andrew Rice, MD, chair of IASP’s Presidential Task Force on Cannabis and Cannabinoid Analgesia.

“This is not a door closing on the topic, but rather a call for more rigorous and robust research to better understand any potential benefits and harms related to the possible use of medical cannabis, cannabis-based medicines and synthetic cannabinoids for pain relief, and to ensure the safety of patients and the public through regulatory standards and safeguards.”

Rice said IASP was concerned that laws allowing the use of medical marijuana were being adopted without the same rigor and regulatory procedures that are followed for pharmaceutical products. Patients who self-treat their pain with cannabis are also at risk, according to Rice, because their doctors often don’t know about their cannabis use.  

“IASP is also calling for the delivery of a comprehensive research agenda. Priorities include identifying patients with pain who may receive the most benefit from cannabis or cannabinoids, and who may be at risk of the most harm,” said former IASP president Lars Arendt-Nielsen, MD, who co-chaired the Cannabis Task Force.

Supporters of medical cannabis dispute the contention that there is inadequate evidence about the use of cannabis for pain.

“These recommendations are political, not scientific. Several peer-reviewed trials have concluded that inhaled cannabis is safe and effective for treating various types of pain, in particular neuropathic pain,” Paul Armentano, Deputy Director of NORML, said in an email to PNN.

Armentano cited a 2017 study from the U.S. National Academy of Sciences, which found “conclusive or substantial evidence” that cannabis is an effective treatment for chronic pain.

“In the real world, the therapeutic use of cannabis is rising among chronic pain patients, many of whom are substituting it in place of opioids. In jurisdictions where cannabis is legally available, chronic pain is the most qualifying condition among medical cannabis patients enrolled in state-specific access programs. To willfully ignore these data is indicative that political considerations, rather than scientific considerations, influenced this group’s decision,” Armentano said.

Medical Cannabis Linked to Rebound Headaches

By Pat Anson, PNN Editor

Medication overuse headache, also known as “rebound” headache, is a common problem for people who frequently use pain medication to relieve headaches and migraine.

According to the American Migraine Foundation, rebound headaches can be triggered by a wide assortment of analgesics, from aspirin and triptans to acetaminophen and opioids. Even caffeine can cause a rebound headache if you consume more than 200mg a day – about two cups of coffee.     

So perhaps it’s not surprising that medical cannabis is also associated with medication overuse headache, according to a preliminary study by researchers at Stanford University School of Medicine.

“Many people with chronic migraine are already self-medicating with cannabis, and there is some evidence that cannabis can help treat other types of chronic pain,” said study author Niushen Zhang, MD, a neurologist who is director of Stanford’s Headache Fellowship Program.

“However, we found that people who were using cannabis had significantly increased odds of also having medication overuse headache, or rebound headache, compared to people who were not using cannabis.”

Zhang and her colleagues looked at the medical records of 368 people who had chronic migraine -- which is 15 or more headache days per month. Less than half were using medical cannabis

Researchers found the cannabis users were six times more likely to have rebound headaches than those who did not use cannabis. People who used cannabis were also more likely to take opioids.  Previous research has found that opioids and cannabis can both influence the part of the brain called the periaqueductal gray, which has been linked to migraine.

Zhang’s study will be presented at the American Academy of Neurology’s annual meeting next month.

Medical cannabis has become a trendy alternative to pharmaceuticals for treating migraine, with research showing that both inhaled and ingested cannabis can reduce migraine pain. 

A recent study of nearly 10,000 people in the U.S. and Canada who used a migraine tracking app found that 82 percent who used cannabis believed it was an effective pain reliever.    

A 2017 study conducted in Israel found that combining THC and CBD in an oral dose was just as effective in treating migraine pain as amitriptyline – a tricyclic antidepressant commonly prescribed for migraine.

And a 2016 study at the University of Colorado found that cannabis significantly reduced the number of migraine headaches. Inhalation appeared to provide the fastest results, while edible cannabis took longer to provide pain relief.

About a billion people worldwide suffer from migraine headaches, which affect three times as many women as men. Over 37 million people in the United States live with migraines, according to the American Migraine Foundation.

Cannabis Reduces Blood Pressure in Older Adults

By Pat Anson, PNN Editor

Medical cannabis is being used to treat dozens of health conditions, from chronic pain, muscle spasms and nausea to hepatitis, HIV and glaucoma.  Now we’re learning that cannabis may also be a useful treatment for high blood pressure.

A small study conducted by researchers at Ben-Gurion University of the Negev (BGU) in Israel found that cannabis significantly reduces systolic and diastolic blood pressure in older adults with hypertension. The study, recently published in the European Journal of Internal Medicine, is believed to be the first to document the cardiovascular benefits of cannabis.

“Older adults are the fastest growing group of medical cannabis users, yet evidence on cardiovascular safety for this population is scarce,” said lead author Dr. Ran Abuhasira of BGU and Soroka University’s Cannabis Clinical Research Institute. "This study is part of our ongoing effort to provide clinical research on the actual physiological effects of cannabis over time."

Twenty-six patients aged 60 and older either smoked cannabis or ingested it through oils, while their blood pressure, heart rate, and body measurements were monitored.  After three months of cannabis therapy, their mean 24-hour systolic and diastolic blood pressures were reduced by 5.0 mmHg and 4.5 mmHg, respectively. Blood pressure was lowest three hours after ingesting cannabis and at night.

Researchers believe that pain relief, the primary reason most patients use medical cannabis, may have contributed to lowered blood pressure.

Previous studies by BGU researchers found that cannabis significantly reduced pain in older adults living with cancer, Parkinson's disease, post-traumatic stress disorder, ulcerative colitis, Crohn's disease, multiple sclerosis and other chronic conditions. Most patients also said their quality of life improved.

A growing number of seniors are discovering the medical benefits of cannabis. A recent survey of patients at a geriatric clinic in Southern California found that over half were using cannabis on a daily or weekly basis, usually to treat pain, difficulty sleeping, anxiety and depression. Although medical marijuana has been legal in California since 1996, nearly two-thirds of those surveyed said they used cannabis for the first time as older adults.

Are Cannabis Dispensaries Really Associated with Fewer Opioid Overdoses?

By Roger Chriss, PNN Columnist

A new study published in The BMJ claims that U.S. counties with medical and recreational cannabis dispensaries have fewer opioid-related deaths.

Researchers at Yale and University of California at Davis found that an increase of just one or two storefront dispensaries in a county was associated with a 17% reduction in all-opioid mortality rates. Deaths involving illicit fentanyl and other synthetic opioids fell by 21 percent.

Although the researchers cautioned that “the associations documented cannot be assumed to be causal,” cannabis supporters were quick to praise the findings.

“The data to date is consistent and persuasive: For many pain patients, cannabis offers a viable alternative to opioids, potentially improving their quality of life while possessing a superior safety profile,” said Paul Armentano, Deputy Director of NORML, a marijuana advocacy group.

While the study findings are interesting, they highlight the importance of considering the complex supply side of legal and illegal drug markets, and how it shapes opioid use and misuse. The study looked at data from over 800 counties with legal dispensaries, and compared them to counts of fatal overdoses between 2015 and 2018.

It turns out many of these counties were on the West Coast, where illicit fentanyl had yet to became as pervasive on the black market as it had in other parts of the country. Since 2018, deaths involving fentanyl have soared on the West Coast. 

“If you were to do the same study with current data, you’d find something different because of the way both opioid deaths and cannabis dispensaries have shifted since then,” Chelsea Shover, PhD, an assistant professor at UCLA School of Medicine told Healthline. 

In general, the opioid overdose crisis has gotten worse in the past couple of years. The CDC recently reported that in the 12 months ending in May 2020, ten western states reported a nearly 100 percent increase in deaths involving illicit fentanyl and other synthetic opioids. The increase was particularly sharp in states that legalized recreational cannabis.  

This is the problem with ecological data and associational findings. If you pick the right time or place, you can get an appealing result. And you may ignore other important issues.  

States that legalized cannabis tend to have better public health and more addiction treatment services. They generally have adopted the Affordable Care Act and Medicaid expansion, and have stronger social safety nets. All of these factors are believed to contribute to rates of substance use disorders and overdose risk.

Ecological data alone never proves anything. It merely suggests associations. If the association holds up over time, then researchers can look into a possible causal relation. If however, the association does not hold up, then claims about causality are pointless.

At this point cannabis does not seem to reliably reduce opioid overdose deaths. Further research will be needed to tease out the effects of cannabis legalization amid all the other factors involved in the overdose crisis.

Roger Chriss lives with Ehlers Danlos syndrome and is a proud member of the Ehlers-Danlos Society. Roger is a technical consultant in Washington state, where he specializes in mathematics and research.

Medical Cannabis Needs Better Research

By Roger Chriss, PNN Columnist

Much of the uncertainty and reluctance about using medical cannabis stems from a lack of high-quality research. Instead of randomized controlled trials, surveys and data-mining are commonly seen, leaving clinicians and policymakers with little to work with.

That is the basis for the American Medical Association’s concerns about states legalizing medical cannabis.

“Scientifically valid and well-controlled clinical trials conducted under federal investigational new drug applications are necessary to assess the safety and effectiveness of all new drugs, including potential cannabis products for medical use,” the AMA declared in a policy statement.

Good research would help reduce such concerns. Unfortunately, a lot of recent research involves poor methodology and problematic funding, weakening potentially useful results.

For example, a recent study published in the journal Cureus found that cannabis was a “useful adjunct and substitute for prescription opioids” for chronic pain patients and had the added benefit of improving their physical function and quality of life.

To conduct the study, researchers surveyed 550 patients being treated at three licensed medical cannabis clinics in the northeastern United States, using an anonymous online survey consisting of 11 questions about medication use, pain levels and side effects.

This is very problematic. A convenience sample is a simple method for quickly grabbing data. Its downsides are that it isn't random and is subject to a lot of selection bias. And anonymous surveys are unreliable. As a 2018 Australian study showed, claims of prescription opioid use by people using medical cannabis are often very inaccurate.

Similarly, an observational study at 21 medical clinics in Canada found that the “high rate of cannabis use for chronic pain and the subsequent reductions in opioid use suggest that cannabis may play a harm reduction role in the opioid overdose crisis.”

But the study was sponsored by Tilray, a Canadian cannabis firm that has provided cannabis for clinical trials and is involved in the adult recreational-use market in Canada. Drug studies sponsored by industry need to be viewed with caution, since such studies are known to produce results favorable to the sponsoring organization.

In general, studies that collect data through convenience samples or anonymously via online surveys or apps are not reliable. And studies funded by industry may be biased.

What Happened to Sue Sisley’s Study?

Good studies do get done. However, their results are not always published.

In 2019 Sue Sisley, a psychiatrist at the Scottsdale Research Institute in Phoenix, finished a study on cannabis for post-traumatic stress disorder (PTSD) that took ten years to complete, promising that “the full results of the study, including all the data, will be publicly released."

But Sisley’s research still hasn’t been published. Last year she admitted the study findings may have been compromised by the poor quality of cannabis that the DEA allows for research.

“Most scientists end up with this mishmash of different strains (including stem sticks, leaves, etc.) — all of it seems to get thrown into a grinder in an overzealous effort to standardize the study drug batches for clinical trials," Sisley said.

Research results need to be published even if they are not positive. There is a tendency to promote positive results and hide negative findings. Publication takes a lot of time and effort, and negative results may impede the flow of research dollars.

But if the benefits and risks of medical cannabis are to be better understood, we need all the results. And researchers should get full credit for their work, even if the results aren’t what advocates or enthusiasts were hoping for.

Medical cannabis needs more high-quality research. Surveys of people recruited from a medical cannabis dispensary cannot be generalized to the population at large, and studies sponsored by industry must be treated with caution. Improving medical cannabis research will go a long way toward helping people use medical cannabis safely and effectively.

Roger Chriss suffers from Ehlers Danlos syndrome and is a proud member of the Ehlers-Danlos Society. Roger is a technical consultant in Washington state, where he specializes in mathematics and research.

Mild Withdrawal Common Among Pain Patients Who Use Cannabis

By Pat Anson, PNN Editor

About 10 percent of patients who use medical cannabis to relieve chronic pain develop more severe withdrawal symptoms, according to a new study that found most patients have only mild symptoms and remain stable after long-term cannabis use.

Researchers at the University of Michigan Medical School and the VA Ann Arbor Healthcare System followed 527 Michigan residents with chronic pain for two years, asking whether they experienced any of 15 different withdrawal symptoms – such as craving, nausea, irritability and aggression - when they had gone a significant amount of time without using cannabis.

At the start of the study, most had only mild (41%) or moderate (34%) withdrawal symptoms, with 25% of the patients classified as having severe withdrawal.  Researchers say many patients were not even aware they experienced withdrawal, attributing symptoms such as fatigue and poor sleep to their underlying pain conditions, not to any dependence on cannabis.

"Some people report experiencing significant benefits from medical cannabis, but our findings suggest a real need to increase awareness about the signs of withdrawal symptoms developing to decrease the potential downsides of cannabis use, especially among those who experience severe or worsening symptoms over time," says lead author Lara Coughlin, PhD, an addiction psychologist at U-M Medical School.

After one year, about 13% of the patients experienced more withdrawal symptoms, with 8% reporting more severe symptoms after two years. People who were younger, smoked cannabis, used larger doses, and had poor mental health were more likely to have severe symptoms.

However, the vast majority of cannabis users did not experience more withdrawal symptoms, with those who reported mild symptoms likely to stay that way. About 20% of patients reported fewer symptoms after one year and 14% had fewer symptoms after two years. Older age and vaping were associated with lower odds of having severe symptoms.     

“The majority of participants remained in their initial withdrawal class throughout the 2-year study period, with the highest stability among those with mild withdrawal symptoms at baseline. Of those who transitioned to another symptom class, transitioning to milder symptoms was slightly more common than transitioning to more severe symptoms,” researchers reported in the journal Addiction.

“For the majority of patients, the current findings indicate that the severity of withdrawal symptoms are likely to remain stable over time.”

Poor sleep was the most common withdrawal symptom, followed by depressed mood, decreased appetite, craving, restlessness, anxiety and irritability. The study did not assess whether cannabis was effective for pain relief or what form of ingestion worked best.

Cannabis Not Perceived As Risky

Most Americans believe cannabis has less abuse potential than alcohol and many commonly prescribed anti-anxiety and pain medications, according to survey results recently published in the journal Addictive Behaviors.

Researchers at the University of Delaware and Michigan State University surveyed over 1,000 adults in 2019 about their views on cannabis products such as hemp, CBD, THC and marijuana. The vast majority felt cannabis products have a valid medical use and have less abuse potential than hydrocodone, oxycodone, Xanax and Valium.

source: addictive behaviors

“These results suggest that consumers perceive CBD as more like an over-the-counter pain reliever such as Tylenol or Advil and less like prescription opioids,” researchers found. “They perceive CBD and hemp as medicinal and as having little potential for abuse, making them an attractive replacement for addictive pain relievers.”

The researchers acknowledged that there is little clinical evidence to support these views, but blame the lack of studies on the federal government’s classification of marijuana as a Schedule I Controlled Substance, saying it has “severely limited research.”

A longtime critic of federal marijuana policy was not surprised by the survey findings.

“The overwhelmingly majority of Americans have long abandoned the federal government’s ‘Flat Earth’ position that marijuana is highly dangerous substance without any therapeutic efficacy,” said Paul Armentano, Deputy Director of NORML, a marijuana advocacy group.

“It is time for Congress to jettison this intellectually dishonest position as well and remove cannabis from the Controlled Substances Act in a manner similar to alcohol — thereby ending the existing state/federal conflict and permitting state governments, not the federal government, to be the primary arbiters of cannabis policy.”

Cannabis Significantly Reduced Rx Opioid Use in Chronic Pain Patients

By Pat Anson, PNN Editor

Nearly half of chronic pain patients using medical cannabis reported significant improvement in their pain levels and most were able to reduce or stop their use of opioid pain medication, according to a large new study.

The findings, recently published in the journal Cureus, involved 550 chronic pain patients being treated at three licensed medical cannabis clinics in the northeastern United States. The study is one of the first to look at patients who were prescribed opioids for at least three months and continued to use opioids after starting cannabis therapy.

“Our results show a remarkable percentage of patients both reporting complete cessation of opioids and decreasing opioid usage by the addition of medical cannabis, with results lasting for over a year for the majority,” wrote lead author Kevin Takakuwa, MD, an emergency medicine physician affiliated with the Society of Cannabis Clinicians.

“We hypothesize these effects may be due to the reported synergistic decrease in pain that has been shown with adding cannabis to opioids. Likely, as a result, the majority expressed not wanting opioids in the future, particularly those in the younger age group.”

Pain patients enrolled in the study initially took a small amount of cannabis orally (a balanced blend of THC and CBD) and titrated to a higher dose until it had an effect.

Almost half (48%) reported a significant decrease in their pain, and most said they had improved quality of life (87%) and better physical function (80%) while using medical cannabis.

Most reported they either stopped using prescription opioids (40%) or reduced their opioid use (45%).  Nearly two thirds said they sustained the change for over a year (65%) and did not want to take opioids again (63%).  

“One reason for our impressive results may be the focused protocol employed by the study sites, which recommends a small amount of oral cannabis taken in conjunction with each opioid medication dose with small increments to titration, in a motivated patient population,” wrote Takakuwa.

“There has never been a randomized controlled human trial examining how to use medical cannabis in combination with opioids and there is no established protocol that exists. Experts disagree on how to manage opioid prescriptions in patients with chronic pain who use cannabis, and many clinicians defer to the patient or dispensary agent on decisions regarding specific cannabis products and dosages.”

But some doctors take another approach and simply get rid of patients after learning they use cannabis. It’s worth noting that nearly one in four patients (24.8%) enrolled in the study reported losing access to prescription medication or medical care as a result of their cannabis use or after testing positive for THC.

The Centers for Disease Control and Prevention specifically recommends that doctors not test for THC or dismiss patients for their cannabis use “because this could constitute patient abandonment and could have adverse consequences for patient safety” by forcing them to live with untreated pain or turn to street drugs.