There are indigenous tribes who use peyote in religious rituals, and users have no higher rate of mental illness than nonusers.
However, drug use in our society doesn't occur under such safe circumstances, and I know people who have been burned by drug use. One is a schizophrenic who used obscene amounts of ecstasy, shrooms, salvia and DMT throughout his 20s and early 30s. When he was 24, he was popular, a great basketball player, and able to interact normally with other people. At 35, he's incapable of holding a job and has been in trouble with the law countless times. His psychological collapse might have happened anyway had he not been using psychedelic drugs, but I suspect it wouldn't have happened in the same way, and it might have been more manageable.
I don't know anyone, though, who has burned out on a small amount of psychedelic drug use. I believe it can probably happen, but I've never seen it. Also, there are a lot of people out there who've used these drugs and had few or no ill effects, and their cases simply aren't reported.
However, drug use in our society doesn't occur under such safe circumstances, and I know people who have been burned by drug use. One is a schizophrenic who used obscene amounts of ecstasy, shrooms, salvia and DMT throughout his 20s and early 30s. When he was 24, he was popular, a great basketball player, and able to interact normally with other people. At 35, he's incapable of holding a job and has been in trouble with the law countless times. His psychological collapse might have happened anyway had he not been using psychedelic drugs, but I suspect it wouldn't have happened in the same way, and it might have been more manageable.
I don't know anyone, though, who has burned out on a small amount of psychedelic drug use. I believe it can probably happen, but I've never seen it. Also, there are a lot of people out there who've used these drugs and had few or no ill effects, and their cases simply aren't reported.