It has been well known since historic times that cannabis may cause a variety of psychiatric symptoms. In fact, the desire to take cannabis or marijuana is primarily to obtain mental effects, and the line may be thin even in an occasional user between experiencing a pleasant and exciting psychoactive effect and a real psychotic episode. “Cannabis psychosis” is a term widely used for psychotic episodes resulting from cannabis use. These occur during or shortly after intake and may last days or weeks, but subside after discontinuation of the drug. They may require hospitalization and medication. Comprehensive summaries of mental health effects of cannabis have been published byMurray and Hall & Degenhardt.
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