A John Hopkins study on the adolescent brain discusses how the increased incidence of schizophrenia and psychosis may take place following early use of marijuana. Clearly more work in this area needs to be done. We can ask Kevin Sabet about this on March 5th, 7PM at Saxe School Auditorium during our Marijuana: Facts vs Myths event.
https://www.sciencedaily.com/releases/2018/12/181217101747.htm