Cannabis use in a large sample of acute psychiatric admissions

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Abstract
A sample of 908 patients drawn from two London Psychiatric Hospitals is described in terms of age, sex, self‐reported drug and alcohol history, drug urinalysis results and initial psychiatric diagnosis. Some (34.5%) of respondents admitted to using cannabis at least once in their lifetime and 13% of those tested had urines positive for cannabis on admission. Cannabis use is commoner in young males. These is a higher likelihood that an initial diagnosis of‘psychosis’will be made at admission if patients either report use of cannabis or present a urine sample positive for cannabis.

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