[svardilfari]

I'd challenge you to read those results again. They admit to the evidence for health effects being elusive (due to limited or no robust studies), yet there is still enough evidence to summarize the following:

"

There is substantial evidence of a statistical association between cannabis use and:

The development of schizophrenia or other psychoses, with the highest risk among the most frequent users (12-1) There is moderate evidence of a statistical association between cannabis use and:

Better cognitive performance among individuals with psychotic disorders and a history of cannabis use (12-2a) Increased symptoms of mania and hypomania in individuals diagnosed with bipolar disorders (regular cannabis use) (12-4) A small increased risk for the development of depressive disorders (12-5) Increased incidence of suicidal ideation and suicide attempts with a higher incidence among heavier users (12-7a) Increased incidence of suicide completion (12-7b) Increased incidence of social anxiety disorder (regular cannabis use) (12-8b)"

National Academies of Sciences, Engineering, and Medicine. 2017. The Health Effects of Cannabis and Cannabinoids: The Current State of Evidence and Recommendations for Research. Washington, DC: The National Academies Press. https://doi.org/10.17226/24625.

I would warrant that these summaries should be a concern for anyone using cannabis and that blanket statements regarding the overall tone and summation of the report negating health effects of cannabis is somewhat misguided.

[achileas]

None of which are causal associations. Given the millennia-long history of cannabis use to self-medicate, and lack of evidence (not without trying!) for a biological mechanism of any of this, it’s probably safe to assume this is largely people with an issue (or a proto-issue) self-medicating.

[kaonwarb]

Your argument appears to be jumping from (lack of causal associations) to (assumption that causality is in the opposite direction).

[pclmulqdq]

This has also been studied more since 2017 now that there are a lot more people taking cannabis, and many of these links have been confirmed, although some have not.

It has also been confirmed that heavy use of marijuana has negative effects on cognitive performance and short-term memory even in adults, although these symptoms go away after you stop using.