[GameMaster]

This one turned out to be totally wrong. Apparently a correlation between marijuana use and psychosis doesn't necessarily mean that marijuana caused the psychosis. Many of the researchers made this clear in their findings, but reporters left it out. Furthermore, none of the stories on this topic explained that the risk of psychosis is small, so a 40% increase isn't that significant to begin with. Reporters also failed to observe that massive increases in marijuana use over the past century have not corresponded with increased rates of psychosis.

http://stopthedrugwar.org/chronicle_...a_does_not_cau