Researchers from the University of Bristol have found regular and occasional cannabis use as a teen is associated with a greater risk of other illicit drug taking in early adulthood. The study by Bristol’s Population Health Science Institute, published online in the Journal of Epidemiology & Community Health, also found cannabis use was associated with harmful drinking and smoking.
Using data from the Avon Longitudinal Study of Parents and Children (ALSPAC), the researchers looked at levels of cannabis use during adolescence to determine whether these might predict other problematic substance misuse in early adulthood – by the age of 21.
The researchers looked at data about cannabis use among 5,315 teens between the ages of 13 and 18. At five time points approximately one year apart cannabis use was categorised as none; occasional (typically less than once a week); or frequent (typically once a week or more).
When the teens reached the a
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