I've seen the opposite. I convinced a cute crazy and sometimes schizo young women to stop with the weed. A year later she couldn't keep her voices under control and went into a clinic, now she is destroyed by pharma.
Until now I've seen only studies about correlation. Many try to explain why one causes another, but nobody has found the mechanisms - most likely because they search for a causation that is not there. Maybe they should try to explain how being stoned can help making inner voices less urgent and demanding.
There are many different levels of schizophrenia. Most shrinks believe that smoking dope exacerbates it, according to what I have read, and dealt with first-hand over 54 years of knowing potheads.
There is a correlation between smoking and schizophrenia, and every single study tries to explain that with one causing the other. But scientists use the abstract and discussion sections of their papers to please the sponsors, and nobody wants natural competition to psychotropic drugs.
I don't think smoking causes it, just amplifies it. Back when I was a pothead, I acted and thought bizarre shit, even when I wasn't high. Nowadays I'm just antisocial.
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