[a_cardboard_box]

> The annual incidence of schizophrenia was stable over time, while the incidence of psychosis NOS increased from 30.0 to 55.1 per 100 000 individuals (83.7%) in the postlegalization period relative to the prelegalization period.

So increased cannabis use after legalization did not result in increased rates of schizophrenia, though it might have made some cases worse.

[mlyle]

Maybe not even worse.

This is looking at what fraction of schizophrenia cases had significant cannabis use.

If more people use cannabis, there will be more of these cases, even if there's no causal link.

[throwawaymaths]

causality might go the other way. having had a friend that was so, i wonder if a significant fraction of schizophrenics use cannabis to be functional in society

[appstorelottery]

Cannabis misuse appears linked to a larger share of schizophrenia cases as I understand it.

[ty6853]

Schizophrenics love to smoke. My unscientific guess is something like 80% smoke a nicotine product or weed.

[anjel]

Scott Alexander wrote an article [0] on the mild antipsychotic effects of nicotine as the reason why such a high proportion of people battling psychosis smoke cigarettes.

[0] https://slatestarcodex.com/2016/01/11/schizophrenia-no-smoki...

[cjbgkagh]

There is the dopamine hypothesis for schizophrenia and new research suggest serotonin also plays a role. Nicotine increases the dopamine in the brain so it sounds like to me smoking would be a form of self medicating.

[zxexz]

Not sure why you're being downvoted. The link is well-documented. I'm pretty certain the only controversies here are in causality.