Family and Caregiver Schizophrenia Discussion Forum

Marijuana and vulnerability to psychosis


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Going from an occasional user of marijuana to a weekly or daily user increases an adolescent’s risk of having recurrent psychotic-like experiences by 159 percent, according to a new Canadian study published today in the Journal of Child Psychology and Psychiatry. The study also reports effects of marijuana use on cognitive development and shows that the link between marijuana use and psychotic-like experiences is best explained by emerging symptoms of depression.

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