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What is already known about the link between cannabis use and psychosis?

■ There is strong evidence to support the hypothesis that cannabis consumption is a risk factor for the development of psychotic symptoms and schizophrenia.

■ This article emphasizes the negative effects of cannabis use in young populations and in those who may confer a genetic risk. We further believe that even in the face of enhanced cognitive function among cannabis-using patients with established schizophrenia, this cannabis use worsens the clinical course and overall prognosis of the disorder.

■ While scientists attempt to clarify the relationship between cannabis and psychosis, it is important that we take the link between cannabis and psychosis seriously by definitively assessing patients for cannabis use. Clinicians should be educating their clients about the potential dangers of using cannabis and the potential bene­fits of quitting.

Read more in Psychiatric Times