Childhood abuse and cannabis use among adolescents with mental health needs in Ontario, Canada

Objective: The purpose of this study was to examine the association between childhood abuse (emotional, physical and sexual abuse) and cannabis use among adolescents with mental health needs. Methods: Data on 3681 adolescent in-patients, 12–18 years old, were obtained from the Resident Assessment Instrument for Mental Health (RAI-MH). Using logistic regression, we estimated the odds of using cannabis by adolescents who experienced childhood abuse after controlling for age, gender, Aboriginal origin, problems with addiction, history of criminal justice involvement and symptoms of depression and mania. Results: There were 1844 adolescents, representing 50.1%, who reported using cannabis within the last 12 months. Controlling for demographic and patient characteristics, we found that cannabis use in the past year was strongly associated with childhood sexual and physical abuse. Compared to non-abused females, females who experienced sexual and physical abuse were more likely to have used cannabis. For males, the experience of physical abuse was marginally associated with cannabis use. Conclusion: The current data demonstrate the strong association between childhood sexual and physical abuse and cannabis use with a particularly strong association for females. Efforts aimed at treating cannabis use in adolescents who present with mental health needs should also consider their abuse histories.