What's NewMarijuana use increases risk for psychosis by 40%
An article by Theresa H.M. Moore, MSc, from the University of Bristol in the United Kingdom, and colleagues was published in the July 28 issue of The Lancet.
Moore compared the results of several research studies that followed people over a period of time (systematic review of longitudinal studies). She found that there is enough new evidence that the use of cannabis (marijuana) increases the risk for later psychotic illness by roughly 40%. The study showed a trend towards an increased risk for depression in people who had used cannabis, but the evidence was not as strong.
Here is a link to a discussion on the article in Medscape: http://www.medscape.com/viewarticle/560746
The article reference is: Lancet. 2007;370:293-294, 319-328. (full versions of Lancet articles are not available online, but the above link does contain referenced details.) www.thelancet.com
Links to other articles on this site about mental illness and cannabis use.