The Office of National Drug Control Policy (ONDCP) noted in its May 3, 2005 website article "Marijuana and Mental Health":

“There is an increased risk of depression, suicidal thoughts and schizophrenia as a result of marijuana use, even among people with no prior history of a disorder….

Recent evidence suggests that some people’s genetic make-up may predispose them to be particularly vulnerable to the effects of marijuana on mental health.”

May 3, 2005