I knew a schz guy years ago, great artist, who smoked constantly. He said it kept him sane. I have n idea what that meant, but it kept him out of the hospital and in the studio. When he got arrested for possession and sent to city lockup for a week, he lost his shit and ended up in psych ward for a month and a half. Came out gorked on Stelazine and Seroquel, could barely talk, stopped taking that shit, started smoking again, and within a month was painting and living life "normally". As normal as a he could be because he still heard voices and had delusions, but he was relatively functional all things considered.