alt Hacker NewsBeyond the semantics, this is what the meta analysis(1) actually says in the abstract
> 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
The paper says there's no evidence of effectiveness in treatment, and evidence of harm.
1: https://www.thelancet.com/journals/lanpsy/article/PIIS2215-0...
It sounds to me like you didn't understand the paper at all, or are worse willfully misrepresenting.
The paper says "insufficient data" for helpfulness for most positive categories (but leans more positive than negative just doesn't reach 95% confidence), but also insufficient data on most negative categories. It finds 5 conditions it's helpful for, and 3 it hurts for.