this post was submitted on 21 Mar 2026
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Global News

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The largest review of medicinal cannabis to date found it doesn’t effectively treat anxiety, depression, or PTSD—despite millions using it for those reasons. Researchers warn it could even make mental health worse, raising risks like psychosis and addiction while delaying proven treatments. Some limited benefits were seen for conditions like insomnia and autism, but the evidence is weak. The findings are fueling calls for stricter oversight as cannabis use continues to rise.

Study: https://www.thelancet.com/journals/lanpsy/article/PIIS2215-0366(26)00015-5/fulltext

Archived version: https://archive.is/newest/https://www.sciencedaily.com/releases/2026/03/260319044656.htm


Disclaimer: The article linked is from a single source with a single perspective. Make sure to cross-check information against multiple sources to get a comprehensive view on the situation.

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[–] Kalothar@lemmy.ca 10 points 1 day ago (1 children)

Here’s the findings and interpretations from the paper

Findings

54 trials were identified for inclusion (2477 participants; 1713 [69%] males, 764 [31%] females; median age 33·3 years [IQR 28·1–38·05; ethnicity data not available). 24 (44%) of these trials had a high risk of bias, and the certainty of evidence for most outcomes was low. Our meta-analysis revealed that a combination of cannabidiol and delta-9-tetrahydrocannabinol reduced cannabis withdrawal symptoms (SMD –0·29, 95% CI –0·57 to –0·02) and weekly grams of cannabis use (–1·00, –1·69 to –0·30) among those with cannabis use disorder, and a reduction in tic severity among those with tic or Tourette's Syndrome (–0·68, –1·03 to –0·34) compared with placebo. Any cannabinoid type led to an increase in sleep time as recorded by an electronic device (0·54, 0·14 to 0·95) and sleep diary (0·55, 0·01 to 1·09) among those with insomnia. There was a reduction in autistic traits (–0·36, –0·66 to –0·07) among those with autism spectrum disorder. Cannabinoids led to an increase in cocaine craving among those with cocaine use disorder (0·69, 0·22 to 1·15) compared with placebo. There were no significant effects on outcomes associated with anxiety, anorexia nervosa, psychotic disorders, post-traumatic stress disorder, and opioid use disorder. There were insufficient data to meta-analyse studies of ADHD, bipolar disorder, obsessive-compulsive disorder, and tobacco use disorder. There was an absence of RCT evidence for the treatment of depression. Meta-analysis revealed higher odds of all-cause adverse events (OR 1·75, 95% CI 1·25 to 2·46) among those using cannabis versus control group (NNTH=7) but no higher odds of serious adverse events or study withdrawal.

Interpretation

There was some evidence that cannabinoids can reduce symptoms of cannabis use disorder, insomnia, tic or Tourette's syndrome, and autism spectrum disorder, but the quality of this evidence was generally low. Cannabinoids were associated with a greater risk of any adverse events but not of serious adverse events. Overall, there is a crucial need for more high-quality research. Given the scarcity of evidence, the routine use of cannabinoids for the treatment of mental disorders and SUDs is currently rarely justified.

[–] rants_unnecessarily@piefed.social 7 points 1 day ago (1 children)

Overall, there is a crucial need for more high-quality research. Given the scarcity of evidence, the routine use of cannabinoids for the treatment of mental disorders and SUDs is currently rarely justified.

I think this is the main conclusion here.

[–] olafurp@lemmy.world 2 points 21 hours ago

Yeah, even the ones where an effect was found have a very low GRADE score (framework for assessing whether conclusions of studies should be used as guidelines) that is affected by risk of biases, directness of evidence, consistency and publication bias.