Not quite answering your question but my uncle has schizophrenia and drug use (particularly cannabis) were (I believe) a large factor in its development. Obviously I know schizophrenia has a genetic basis, can't be *caused* by drugs etc. But I do feel that it was perhaps the thing that "triggered off", if you like, his schizophrenia, especially hallucinations and paranoia and so on.
Part of the reason I have never touched the stuff.
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