The association between cannabis use, anxiety and depression in Norwegian adolescents
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- Institutt for psykologi 
Cannabis is one of the most commonly used substances across different age groups. Comorbidity between anxiety, depressive episodes and substance use is furthermore common. The aim of the study was to explore the use of cannabis among Norwegian adolescents, and examine the association between self-reported symptoms of anxiety and depression and the use of cannabis. The sample consisted of 36,715 Norwegian adolescents at the age of 13 to 17. Cannabis use was found to be more prevalent among the older grades and the use increases with age. The results show that cannabis users report significantly more symptoms of anxiety and depression compared to non-users. The difference between users and nonusers, is further emphasized in the findings that there were no significant difference on the anxiety and depression scores for those who had tried the drug once compared to six or more times. More longitudinal studies are needed to get a better understanding of the causality of cannabis use and mental health.