Cannabis might trigger psychosis in vulnerable individuals, but conflicting evidence leaves many open questions Aug 14, 2014 |By Victoria Stern
Many studies show that teens who use marijuana face a greater risk of later developing schizophrenia or symptoms of it, especially if they have a genetic predisposition.
...
Yet despite these results and an uptick in marijuana use in the 1970s and 1980s, other researchers have not uncovered an increase in the incidence of schizophrenia in the general Swedish population ...