There may be more than one cause of schizophrenia and more than one disorder that are being diagnosed as a single disease. But for sure some people seem to have a predisposition that is triggered by pot or psychedelics. Some causes may be infectious pathogens such as viruses, bacteria, fungi https://pubmed.ncbi.nlm.nih.gov/18591925/ https://pubmed.ncbi.nlm.nih.gov/12878806/ Fungi in particular have been known to fuck with the neurology of hosts in order to turn them in to dysfunctional zombies to help the fungus complete its life cycle and they use substances like psilocybin to do it. https://www.newsweek.com/cicada-parasitic-fungus-bugs-mate-spread-1594266 My personal experience is that I have known several schizos who directly attributed their illness to using acid and / or pot. Perhaps it triggers the disease in some people who already have some neurological damage. Jews have unusual genes related to neurology. These genes are often responsible for hi IQ in the heterozygous case but may lead to disease in the homozygous case. This could account for some higher rates of mental illness. Psychodelics seem to produce schizophrenic like thinking temporarily, which don’t cause permanent neurological changes in most people. But perhaps the tolerance threshold for these drugs is much lower in some people because of a gene or previous brain damage from an infection. Certain drugs really do seem to be a trigger in people. Interestingly it doesn’t seem to happen with alcolhol or heroin. I don’t know about coke.