Environmental factors account for the link between cannabis and psychosis

A great deal of previous research has suggested a link between cannabis use and psychotic episodes. New research suggests that this association is due mostly to shared environmental factors rather than direct causation or shared genetic risk factors.

In the first direct test of whether the link between cannabis use and psychosis is due more to environmental or genetic factors, Sania Shakoor of the University of London and colleagues show that environmental factors can account for the co-occurrence of cannabis use and paranoia, cognitive disorganization, and negative symptoms (flat affect, low motivation). Their results are published in the June issue of the journal Psychiatry Research.

 

Previous work has shown a strong link between cannabis use (smoking marijuana) and the development of psychosis. Overall, a regular cannabis user has approximately double the risk of developing a psychotic disorder than a non-user. The cause of this connection, however, is unknown.

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URL: 
http://www.psypost.org/2015/06/environmental-factors-account-for-the-link-between-cannabis-and-psychosis-34964