Abstract: Objective To determine whether cannabis use in adolescence predisposes to higher rates of depression and anxiety in young adulthood. Design Seven wave cohort study over six years. Setting 44 schools in the Australian state of Victoria. Participants A statewide secondary school sample of 1601 students aged 14›15 followed for seven years. Main outcome measure Interview measure of depression and anxiety (revised clinical interview schedule) at wave 7. Results Some 60% of participants had used cannabis by the age of 20; 7% were daily users at tha...
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