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Objective: Cannabis use among veterans in Canada is an understudied public health priority. The current study examined cannabis use prevalence and the relationships between child maltreatment histories and deployment-related traumatic events (DRTEs) with past 12-month cannabis use including sex differences among Canadian veterans., Method: Data were drawn from the 2018 Canadian Armed Forces Members and Veterans Mental Health Follow-up Survey (response rate 68.7%; veterans only n  = 1,992). Five child maltreatment types and 9 types of DRTEs were assessed in relation to the past 12-month cannabis use., Results: The prevalence of lifetime and past 12-month cannabis use was 49.4% and 16.7%, respectively. Females were less likely than males to report lifetime cannabis use (41.9% vs. 50.4%; odds ratio [OR] 0.71; 95% CI, - 0.59 to 0.86). No sex differences were noted for past 12-month cannabis use (14.1% vs. 17.0%; OR 0.80; 95% CI, 0.60 to 1.07). Physical abuse, sexual abuse, neglect, any child maltreatment, most individual DRTEs, and any DRTE were associated with increased odds of past 12-month cannabis use after adjusting for sociodemographic and military variables. Some models were attenuated and/or nonsignificant after further adjustments for mental disorders and chronic pain conditions. Sex did not statistically significantly moderate these relationships. Cumulative effects of having experienced both child maltreatment and DRTEs compared to DRTEs alone increased the odds of past 12-month cannabis use. Statistically significant interaction effects between child maltreatment history and DRTE on cannabis use were not found., Conclusions: Child maltreatment histories and DRTEs increased the likelihood of past 12-month cannabis use among Canadian veterans. A history of child maltreatment, compared to DRTEs, indicated a more robust relationship. Understanding the links between child maltreatment, DRTEs, and cannabis use along with mental disorders and chronic pain conditions is important for developing interventions and improving health outcomes among veterans., Competing Interests: Declaration of Conflicting InterestsThe authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Adverse childhood experiences (ACEs) are common and related to substance use problems in adulthood. Less is known about these relationships in adolescence and if experiencing ACEs in addition to peer victimization (or bullying) would have an interaction or cumulative effect on the odds of adolescent substance use. Data were used from the Well-Being and Experiences Study (The WE Study), a cross-sectional survey of adolescents aged 14–17 years (n = 1002) in Manitoba, Canada collected between July 2017 and October 2018. Statistical methods included descriptive statistics and logistic regression models. The prevalence of experiencing any of the 12 ACEs was 75.1 %. The prevalence of any peer victimization (monthly or more often) was 24.1 %. All individual ACEs were associated with increased odds of substance use. No significant interaction effects between ACEs and peer victimization on substance use were found. Significant cumulative effects were found, indicating that experiencing both ACEs and peer victimization, compared with experiencing ACEs only, significantly increased the odds of substance use among adolescents. The odds of substance use becomes significantly greater if the adolescent with a history of ACEs also experiences peer victimization. Further research aimed at effective prevention of ACEs, peer victimization, and substance use is needed. [ABSTRACT FROM AUTHOR]