Abstract
Summary Little is known about the extent of marihuana use among adults, except for heavy users and special populations. This study reports the extent of marihuana use among 1,200 carefully chosen adults in Toronto in 1971. It was found that 12.2 per cent of males and 5.5 per cent of females aged 18 and over had used marihuana in the past year. However, the frequencies rise to 41.5 per cent and 20 per cent respectively in the under 25 group. Marihuana use is most common among males, single or divorced persons and the better educated. However, social variable, explain little of the variation in marihuana use frequency. Multi-drug use, including higher use of alcohol characterizes marihuana users. They are similar in extroversion and neuroticism to normals but higher in both than are non-users.
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