Reefer Madness: An Update

In a study of 3801 young adults that was just published in the Archives of General Psychiatry, Australian researchers have concluded that early and prolonged use of marijuana is associated with psychosis-related outcomes in young adults. They found a “dose-response” relationship: the longer marijuana was used, the higher the risk was out eventual psychosis.

For more on marijuana and for a concise medical history of the use of cannabis, see "The Past, Present, and Future of Medical Marijuana in the United States."