Cannabis use in a drug and alcohol clinic population.

Cannabis using behaviour was determined, by structured interview, in 100 consecutive clinic attenders who had used cannabis within 28 days. Subjects were white, 85 were male, mean age was 27.6 years and duration of cannabis use was 12.4 years. The mean consumption of the past week was 10.5 g. Sixty percent smoked daily. The average cannabis cigarette comprised three cigarette papers, the tobacco from three-quarters of a king sized cigarette, and 0.35 g of cannabis resin. Eating cannabis was unusual. Fifty subjects had a conviction for possession of cannabis. Subjects fulfilled criteria for 'heavy' use. The findings are discussed in the context of previous research.