As much as I know will shrooms trigger psychosis only in people who carry genetic predispositions for it and only with massive abuse (regular use of large doses) and bad circumstances. However, same goes for THC, LSD and all the sorts. I don't want to promote drug use, I was just curious as to why you labelled particularly shrooms as damaging. Which by the way you can also get as tablets (psilocybin) with known doses as used in research.