From the Editor

“In the USA and Europe, the concentration of THC has more than doubled over the past 10 years…”

So notes a new paper in The Lancet Psychiatry.

Canada legalized cannabis for recreational purposes four years ago; other countries have done the same, as have almost two dozen US states. But how has cannabis itself changed over time? What are the implications for mental health disorders? And public policy? In the first selection, quoted above, Kat Petrilli (of the University of Bath) and her co-authors do a systematic review of cannabis potency and mental health and attempt to answer these questions. Drawing on 20 studies, they find: “Overall, the evidence suggests that the use of higher potency cannabis, compared with lower potency cannabis, is associated with an increased risk of psychosis, and this risk is higher in people who use cannabis daily.” We look at the paper and weigh its clinical implications.

In the second selection, using Ontario data, Dr. Daniel T. Myran (of the University of Ottawa) and his co-authors consider the effect of edible cannabis legalization on poisonings of children. Writing for The New England Journal of Medicine, they compare jurisdictions with legal sales (Alberta, British Columbia, and Ontario) with a province that hasn’t legalized that form of cannabis (Quebec). “Our data indicate that legalization was associated with marked increases in hospitalizations for cannabis poisoning in children.”

And, in the third selection, Shirley Nicholson writes about substance and stigma with a deeply personal essay. In this piece for CBC First Person, she discusses her son’s struggles and his death from an overdose. She writes: “He didn’t plan to die at 27. He was more than his addictions. He was our son, our brother, our grandson, our nephew, our cousin and we all loved him so.”


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