Mon Dec 12, 2011, 05:30 AM
RainDog (28,784 posts)
Peer-reviewed journal finds no link between cannabis and schizophrenia
Last edited Sat Dec 17, 2011, 07:17 PM - Edit history (1)
This paper investigates whether this (a predicted increase in schizophrenia and/or psychosis among cannabis users) has occurred in the UK by examining trends in the annual prevalence and incidence of schizophrenia and psychoses, as measured by diagnosed cases from 1996 to 2005.
Studies that claimed schizophrenia cast in doubt (Sept. 2009):
Previous research has suggested cannabis use increases the risk of being diagnosed with schizophrenia or other psychotic disorders.
Minimal Link Between Psychosis and Marijuana (Oct. 2009):
Scientists from Bristol, Cambridge and the London School of Hygiene and Tropical Medicine took the latest information on numbers of cannabis users, the risk of developing schizophrenia, and the risk that cannabis use causes schizophrenia to estimate how many cannabis users may need to be stopped to prevent one case of schizophrenia. The study found it would be necessary to stop 2800 heavy cannabis users in young men and over 5000 heavy cannabis users in young women to prevent a single case of schizophrenia. Among light cannabis users, those numbers rise to over 10,000 young men and nearly 30,000 young women to prevent one case of schizophrenia.
Cannabis-induced schizophrenia is merely schizophrenia (Nov. 2008)
In a previous study, Arendt and colleagues found that nearly half of people who had an episode of cannabis-induced psychosis went on to develop schizophrenia within the next six years. In the current study, the researchers looked at the genetic roots of both conditions by comparing the family histories of 609 people treated for cannabis-induced psychosis and 6,476 who had been treated for schizophrenia or a related psychiatric condition.
Roger Pertwee, leading British pharmacologist, says cannabis is not a threat to the general population in regard to schizophrenia. Only those with existing risk factors are at risk.
you could identify people who might be at risk of developing schizophrenia. Cannabis is one factor which increases the risk of schizophrenia, but only if it's mixed with a bad childhood environment or a genetic predisposition to schizophrenia.
...and no indication of brain damage with heavy usage (July 2003):
Long-term and even daily marijuana use doesn't appear to cause permanent brain damage, adding to evidence that it can be a safe and effective treatment for a wide range of diseases, say researchers.
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