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To: Wharf Rat who wrote (238112)	7/28/2007 9:59:07 AM
From: jlallen	Read Replies (2) \| Respond to of 281500

Marijuana use boosts risk of psychosis: study Last Updated: Thursday, December 2, 2004 \| 2:52 PM ET CBC News Teens and young adults who frequently use marijuana are at higher risk of developing psychotic symptoms later in life, researchers say. Dutch scientists studied 2,437 young people aged 14-24 to identify their predisposition to psychosis. Participants were questioned about their use of cannabis and followed for up to four years. INDEPTH: Marijuana In the study, researchers used a broad definition of psychosis, ranging from occasionally hearing voices and paranoia to schizophrenia. Jim van Os of the University of Maastricht in the Netherlands and his team found 21 per cent of cannabis users had experienced psychotic symptoms compared with 15 per cent among non-users. The odds of experiencing symptoms were also higher among those who frequently smoked marijuana, after adjusting for other factors, such as social and economic status, use of other drugs, alcohol and tobacco. cbc.ca

To: Wharf Rat who wrote (238112)	7/28/2007 10:00:32 AM
From: jlallen	Respond to of 281500

Study: Even Infrequent Use of Marijuana Increases Risk of Psychosis by 40 Percent LONDON — Using marijuana seems to increase the chance of becoming psychotic, researchers report in an analysis of past research that reignites the issue of whether pot is dangerous. The new review suggests that even infrequent use could raise the small but real risk of this serious mental illness by 40 percent. Doctors have long suspected a connection and say the latest findings underline the need to highlight marijuana’s long-term risks. The research, paid for by the British Health Department, is being published Friday in medical journal The Lancet. “The available evidence now suggests that cannabis is not as harmless as many people think,” said Dr. Stanley Zammit, one of the study’s authors and a lecturer in the department of psychological medicine at Cardiff University. The researchers said they couldn’t prove that marijuana use itself increases the risk of psychosis, a category of several disorders with schizophrenia being the most commonly known. There could be something else about marijuana users, “like their tendency to use other drugs or certain personality traits, that could be causing the psychoses,” Zammit said plnewsforum.com