The Link Between Marijuana, Psychosis, and Suicide JOHN STONESTREET WITH ROBERTO RIVERA Recreational marijuana is legal in 11 states and another 21 states permit the use of so-called “medical marijuana.” I say “so-called” because, as NYU drug policy expert Mark Kleinman has put it, “the vast majority of ‘patients’ buying ‘medical marijuana’ aren’t doing so under … More The Link Between Marijuana, Psychosis, and Suicide