and alcohol can lead to homlessness, no one is saying it is risk free.
8 years ago my boy was sectioned and taken into a mental ward with schizophrenia triggered by smoking cannabis
Only ever seen it for amphetamine and the problem is we dont know what triggered what. Did they take drugs due to psychosis or did it cause it?
I dont mean to debate your son your case i mean in general
As above it is unlikely to help anyone with their mental well being but i am not sure it always "causes" it either.
So can fags and booze- very few [ practically none]drug users and /or addicts have never had a drink but again i doubt it is casual