Tag: cannabis

Reading of the Week: Cannabis – the New Lancet Psych Paper; Also, the Skepticism of Joel Paris and Mania & the Law

April 9, 2026 / / 1 Comment

From the Editor

What do you say to your patient when he insists that cannabis is helping him with his mental disorder? What is the evidence?

Of course, many papers have been published on the topic. That said, Jack Wilson (of The University of Sydney) and his co-authors contribute nicely to the literature with their new systematic review and meta-analysis – arguably the most comprehensive to date – published in Lancet Psychiatry. 54 RCTs were included, involving almost 2 500 participants, including those with depression and PTSD. “Given the scarcity of evidence, the routine use of cannabinoids for the treatment of mental disorders and substance use disorders is currently rarely justified.” We discuss the paper and its implications.

What happens to your view of our field after five decades spent treating tens of thousands of patients, leading major institutions, and authoring dozens of books and papers? In a new episode of Quick Takes, Dr. Joel Paris, former chair of the Department of Psychiatry at McGill University and a self-proclaimed skeptic, discusses the past, present, and future of psychiatry. Never one to shy away from sharing his controversial views, Dr. Paris dives into his thoughts on the DSM system (he’s not a fan) and what he sees as “fads and facilities” – such as the overdiagnosis of adult ADHD, trauma, and autism. “Over time, my perspective on psychiatry has changed in the direction of greater skepticism.”

Finally, in the third selection from The Canadian Journal of Psychiatry, Drs. Kenya A. Costa-Dookhan and Andrew Lustig (both of the University of Toronto) discuss what to do when a patient doesn’t meet criteria for an involuntary admission but isn’t well. Drawing on a case involving a patient experiencing a manic episode, they offer three strategies. “When mania outruns the law, our task is to accompany our patients with clarity, compassion, and collective integrity, not toward cure, but toward the next opportunity for care.”

DG

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Reading of the Week: Cannabis, with Papers from CMAJ and JAMA; Also, Carroll on Legalization

February 12, 2026 /

From the Editor

With more and more countries legalizing cannabis, we must wonder about the health implications. This week’s Reading offers three selections.

How does legalization (and increased use) affect mental health? Is there more psychosis? In the first selection, just published in CMAJ, Dr. Daniel T. Myran (of the University of Toronto) and his co-authors analyzed data from 12 million people born in Ontario, Canada, to attempt to answer those questions. They looked at diagnoses of psychosis-related disorders and years of birth, finding those born in the early 2000s were about twice as likely to have been diagnosed with a psychotic disorder by age 20. “The incidence of psychotic disorders has increased in more recent birth cohorts.” We consider the paper and its implications.

In a recent US survey, 20% of respondents reported using CBD in the last year – which is often assumed to be safer than THC. In the second selection from JAMA Internal Medicine, Jeffry Florian (of the US Food and Drug Administration) and his co-authors analyzed liver enzymes of healthy participants randomized to CBD or placebo. “In this randomized double-blinded placebo-controlled trial, 5.6% of healthy adults administered CBD 5 mg/kg/d for up to 28 days experienced liver enzyme level elevations greater than 3 times the upper limit of normal.”

Finally, in the third selection, Dr. Aaron E. Carroll (of Indiana University) writes about cannabis legalization. While arguing that there are successes with this policy change, he also worries about long-term consequences. He writes that reforms are needed, from better regulation to more education. “The real lesson here isn’t even about cannabis. It’s about our capacity to learn and adapt.”

DG

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Reading of the Week: Antidepressants & Side Effects – the New Lancet Paper; Also, Medical Cannabis & Addiction, and AI Hallucinations

December 18, 2025 /

From the Editor

What are the physical side effects of antidepressants? In a new, impressive Lancet study, Toby Pillinger (of King’s College London) and his co-authors attempt to answer that old question with a new approach: the first systematic review and meta-analysis. They drew on 168 RCTs that measured physical health effects of antidepressants, including almost 59 000 participants and comparisons of 30 antidepressants. “We found strong evidence that antidepressants differ markedly in their physiological effects, particularly for cardiometabolic parameters.” We consider the paper and its implications.

How safe is cannabis for those taking it for medical purposes? Dr. Beth Han (of NIMH) and her colleagues report findings from a US survey in a new JAMA Psychiatry brief report, focusing on cannabis use disorder (CUD). They report that cannabis use wasn’t less addictive when used for medical reasons. “Clinicians should consider addiction risk before recommending medical cannabis and, if they do, should monitor for CUD emergence.”

The BMJ runs humorous articles in its Christmas issue. The journal doesn’t disappoint this year. Dr. Roberto A. Correa Soto (of the Universidad de los Andes) and his co-authors write about AI hallucinations and doctor BS (yes, you read that correctly). Frankly, the paper is worth reading for the profanity alone. “Both doctors and large language models (LLMs) are driven to produce misinformation – ‘bullshit’ and ‘hallucinations’ – owing to a shared pressure to provide answers, prioritising the appearance of competence over accuracy.”

There will be no Readings for the next three weeks. 

DG

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Reading of the Week: Suicide-related Reporting – the New BJP Paper; Also, Cannabis Use & Psychosis, and Mental Health & Working from Home

October 16, 2025 /

From the Editor

The stakes are high: news coverage of suicide can affect suicide rates. So how responsibly do journalists report? How has this changed with time?

In a new paper for The British Journal of Psychiatry, Dr. Mark Sinyor (of the University of Toronto) and his co-authors attempt to answer these questions. Focusing on US network news, they analyzed suicide-related news segments over an 11-year period, including for putatively harmful characteristics. “Coverage of suicide stories by major US cable news networks was often inconsistent with responsible reporting guidelines.” We consider the paper and its implications.

In the second selection from JAMA Psychiatry, Dr. Andrew S. Hyatt (of Harvard University) and his co-authors look at cannabis use after legalization and those individuals with psychosis. In this brief report, they drew from a US database with almost 2 000 participants. “In this study, individuals with psychosis reported a large increase in current cannabis use following legalization and commercialization of cannabis in their state, and by larger amounts than previously reported estimates of the general population.”

Is working from home better for mental health? In the third selection, from Mental Health & Prevention, Jean-Philippe Chaput (of the University of Ottawa) and his co-authors drew on national data to analyze work location and several self-rated measures, including mental health. The dataset is impressive with almost 25 000 participants. “We observed that work location was not related to self-rated mental health, life satisfaction, or life and work stress.”

DG

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Reading of the Week: Bipolar Disorder Drug Prescribing – Bad News? The New CJP Paper; Also, An AI Warning and Cannabis & Psychosis

September 11, 2025 /

From the Editor

There are more medication options than ever for the treatment of bipolar disorder. What are physicians prescribing? How often do we use lithium, arguably the best medication?

In the first selection, from The Canadian Journal of Psychiatry, Samreen Shafiq (of the University of Calgary) and her co-authors attempt to answer those questions in a new study. They drew on Alberta government data, including more than 130 000 individuals with bipolar disorder and more than nine million prescriptions. “Overall, we uncovered a concerning trend in the prescribing patterns for bipolar disorder treatment, with antidepressants and second-generation antipsychotics being prescribed frequently and a decline in prescribing of lithium and other mood stabilizers.” We consider the paper and its implications.

What would John Cade think?

In the second selection, Dr. Allen Frances (of Duke University) writes about AI chatbots and psychotherapy in The British Journal of Psychiatry. He notes their “remarkable fluency” and argues that there are clear benefits to AI psychotherapy. He also comments on dangers, and he doesn’t mince his words. “Artificial intelligence is an existential threat to our profession. Already a very tough competitor, it will become ever more imposing with increasing technical power, rapidly expanding clinical experience and widespread public familiarity.”

And in the third section, Sophie Li (of the University of Ottawa) and her co-authors consider psychosis and cannabis in a concise CMAJ paper. They make several points, including: “The tetrahydrocannabinol (THC) content of cannabis has roughly quintupled in the past 2 decades, from around 4% in the 2000s to more than 20% in most legal dried cannabis in Canada by 2023.”

There will be no Reading next week.

DG

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Reading of the Week: Substance – with New Papers from JAMA Psych, Netw Open & Brookings; Also, the Latest in the News

February 20, 2025 /

From the Editor

For many of our patients, the pull of alcohol can be strong with devastating effects. In recent months, semaglutide, better known for its weight-loss properties, has generated some buzz. Could semaglutide help those with alcohol problems?

In the first selection, Christian S. Hendershot (of the University of Southern California) and his co-authors attempt to answer that question in a new paper for JAMA Psychiatry. They conducted an RCT with 48 participants randomized to semaglutide or placebo over nine weeks, measuring alcohol consumption and craving outcomes, and finding that people taking semaglutide consumed less alcohol by some measures. “These findings provide initial prospective evidence that low-dose semaglutide can reduce craving and some drinking outcomes, justifying larger clinical trials to evaluate GLP-1RAs for alcohol use disorder.” We consider the paper and its implications.

In the second selection, Joshua L. Gowin (of the University of Colorado) and his co-authors explore the impact of heavy lifetime and recent cannabis use on brain function in a new paper for JAMA Network Open. They analyzed data from more than 1 000 young adults, including brain imaging, focusing on tasks administered during fMRIs sessions. “Cannabis use is associated with short- and long-term brain function outcomes, especially during working memory tasks.”

Finally, we explore the latest news with articles from The New York Times and The Free Press, and a new report from the Brookings Institution. The topics: Oregon’s decriminalization, Robert F. Kennedy’s nomination, and decriminalization across North America.

DG

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Reading of the Week: Are Mental Disorders Contagious in Teens? The New JAMA Psych Study; Also, Edibles & Older Adults, and Harmon on Discrimination

May 30, 2024 /

From the Editor

People with mental disorders often have family members who have been touched by illness – a genetic tie, well established in the literature. But what about the influence of peer groups? A small body of literature suggests a connection between social circles and diagnosis. How can we understand this? Are mental disorders contagious?

In the first selection, Jussi Alho (of the University of Helsinki) and her co-authors attempt to answer those questions in a new study for JAMA Psychiatry. They did a cohort study, drawing on Finnish databases, and involving more than 700 000 people. They considered individuals who had a classmate diagnosed with a mental disorder in grade 9. “We found an association between having peers diagnosed with a mental disorder during adolescence and an increased risk of receiving a mental disorder diagnosis later in life.” We analyze the study and its implications.

How have cannabis poisonings increased with the legalization of edibles in Canada? In the second selection, a research letter for JAMA Internal Medicine, Dr. Nathan M. Stall (of the University of Toronto) and his co-authors looked at an 8-year period and focused on older adults, finding 2 322 ED visits in Ontario. “The largest increases occurred after edible cannabis became legally available for retail sale, a phenomenon similarly observed in Canadian children.”

And in the third selection, Caroline Payton Harmon, who is a PhD candidate at Rutgers University, describes the people she met in substance use treatment. The essay, published in The Lancet Psychiatry, is personal and notes the contrasts between those of different socioeconomic backgrounds. “The health-care system sees money and sees patients who are not worth the cost of treatment.”

DG

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Reading of the Week: Cannabis & Cardiac Health – the New JAHA Study; Also, Burnout & Outcomes, and Dr. Mary Seeman on Scaling Down

May 9, 2024 /

From the Editor

Our patients increasingly use cannabis, and we worry about the impact on their mental health. But what about the impact on their physical health?

In the first selection, Abra M. Jeffers (of Harvard University) and her co-authors consider cannabis and cardiac health. In a new paper for the Journal of the American Heart Association, they analyzed cardiac outcomes, drawing on survey data and involving more than 400 000 participants, some of whom used cannabis. “Cannabis use is associated with adverse cardiovascular outcomes, with heavier use (more days per month) associated with higher odds of adverse outcomes.” We review the paper and its implications.

In the second selection, Nina A. Sayer (of the University of Minneapolis) and her co-authors look at burnout in a new paper for JAMA Network Open. In a cohort study involving 165 therapists and almost 1 300 patients, they note a connection between provider burnout and PTSD outcomes. “These findings suggest that interventions to reduce therapist burnout might also result in more patients experiencing clinically meaningful improvement…”

Dr. Mary Seeman (of the University of Toronto), who died in late April, had a storied career as a psychiatrist. She had major roles, including the Tapscott Chair in Schizophrenia at the University of Toronto. In a 2003 paper for The American Journal of Psychiatry, she reflects on her work with a patient. This essay – the third selection this week – notes the decades-long connection between doctor and patient. “Her faith in me keeps me coming into work each morning, often tired and achy, sometimes trying unsuccessfully to remember the comforting word I want to be able to say.”

DG

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Reading of the Week: Cannabis-Related Disorders – the new NEJM Paper; Also, Surgeons & Opioid Prescribing and MAiD & Mental Illness

February 8, 2024 /

From the Editor

Cannabis use is increasingly common. Should you be screening for misuse? What’s the role of drug testing? Do short interventions work?

In the first selection, we look at the new paper on cannabis-related disorders, published in The New England Journal of Medicine. Dr. David A. Gorelick (of the University of Maryland) comments on cannabis use disorder, offering practical suggestions, drawing on the latest in the literature (with 76 references). “Cannabis use disorder and heavy or long-term cannabis use have adverse effects on physical and psychological health.” We discuss the paper and its takeaways.

In the second selection, Jason Zhang (of the University of Michigan) and his co-authors consider surgeons and the prescribing of opioids. Given past problems, are surgeons more frugal when they reach for the prescription pad? Drawing on an impressive US database, they analyzed dispensed opioids from 2016 to 2022 in a new JAMA Network Open research letter, finding a step in the right direction – but just a step. “Despite large reductions in opioid prescribing, surgical opioid stewardship initiatives remain important.”

And in the third selection, The Globe and Mail weighs in on the recent decision to delay the expansion of medical assistance in dying, or MAiD, for mental disorders. In an unsigned editorial, the authors recognize the suffering of some, but argue that not enough has been done to define the term irremediable. “A delay is not enough.”

DG

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Reading of the Week: Catatonia – the new NEJM Review; CBD for Bipolar and Dr. Samuels on Medical Assistance in Dying

November 23, 2023 /

From the Editor

Catatonia has been well described but is poorly understood.

So write Drs. Stephan Heckers and Sebastian Walther (both of Vanderbilt University) in a new review. We could add: catatonia is often striking. I remember a patient who literally sat for hours in his chair with catatonia secondary to schizophrenia. His family, in some denial, had insisted that his poor eating was related to hospital food and that his lack of activity had to do with the boredom of the ward.

Drs. Heckers and Walther’s review, just published in The New England Journal of Medicine, notes: “Catatonia is common in psychiatric emergency rooms and inpatient units,” with an estimated prevalence of 9% to 30%. They describe the diagnosis and treatment. We consider the paper and its implications.

Waxy flexibility (from catatonia) in an undated photo

Interest in CBD has surged in recent years. Can it help with the tough clinical problem of bipolar depression? In the second selection, Dr. Jairo Vinícius Pinto (of the University of São Paulo) and his co-authors attempt to answer that question in a new Canadian Journal of Psychiatry paper. They describe a pilot study, with 35 patients randomized to CBD or placebo, finding: “cannabidiol did not show significantly higher adverse effects than placebo.”

And in the third selection, Dr. Hannah Samuels (of the University of Toronto) discusses medical assistance in dying in a paper for Academic Psychiatry. This resident of psychiatry describes a patient who, dealing with pain, opted for MAiD. Dr. Samuels considers the decision but her ambivalence in part stemming from her training. “I felt sad, confused, and morally conflicted. Mrs. L never faltered in her confidence that this was the right decision for her, but I could not understand it.”

DG

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