From what I'm aware, Schizophrenia develops in the mid 20s—it's entirely possible someone could become a regular user before realizing they were schizophrenic.

From what I'm aware, Schizophrenia develops in the mid 20s—it's entirely possible someone could become a regular user before realizing they were schizophrenic. And (as I mentioned below) I've witnessed a weed-induced psychotic episode. I think it's highly unlikely someone would wish to continue after experiencing that.