I have friends who are now diagnosed schizophrenics, whose first major symptoms occurred while they were smoking weed. I have more friends whose schizophrenia appeared during or immediately after use of psychedelics. I tend to favor the belief that they had an underlying condition that was triggered, but I’m also slightly suspicious of the reasoning, which is too much like “they were already cracked and that’s why they broke at that time” which can be tautological.

Hopefully, someone will do a good study of people who show early or precursor symptoms of schizophrenia and look at their risk of getting full-blown symptoms versus the baseline population, with or without recreational drug use.