I've been a user of psychedelic substance for several years now and I've seen a few adverse reactions to psychedelics but it's usually because one is at conflict with something inside there have been many studies on psychedelics and mental illness and to my knowledge all credible studies revealed the same thing and that is psychedelics do by no means cause mental illness but they do have a way of triggering illnesses in people who have a predisposition to develop the mental illness later in lifeI stick to pot these days. If I do not like the high it will be gone in 2 hours and halfway gone in 1 or less. Acid was a bummer after a while. Shrooms good to go always.
I have seen others and myself suffer with mental problems and some did drugs and others not much at all. It is a mystery I guess. If you have mental problems and then trip out heavy, well it is just asking for it imo. If you do the drugs under control and all, very little chance of bad happening. Most just take whatever, wherever and expect the best.