Association between substance use and professional outcomes among medical students: Findings from a Canadian cross-sectional survey.

Background: While substance use is common among medical students, there is limited research on this topic involving Canadian medical students or exploring its associations with professional outcomes. The present study examines the association between Canadian medical students' substance use and related counselling attitudes and practices, career satisfaction, academic/clinical workload, and the medical school environment. Methods: We sent an electronic cross-sectional survey to students attending all 17 Canadian medical schools between November 2015 and March 2016. A total of 4,438 participants completed the survey across four years of study, with a participation rate of 40.2%. We considered four categories of substance use: cannabis, alcohol, non-medical use of prescription stimulants (NPS), and cigarettes. Covariates included professional attitudes (e.g., career satisfaction, distress, patient counselling on alcohol or smoking cessation), specialty of interest, learner mistreatment, and perceived medical school support. We used multivariate logistic regression models, generating adjusted odds ratios (AORs), to examine covariates associated with substance use and how substance use (as a covariate) was associated with different professional outcomes. Results: Individuals more interested in "lifestyle" specialties (AOR, 1.81; 95% CI, 1.08-3.05) and surgical specialties (AOR, 1.69; 95% CI, 1.16-2.47) were more likely to report excessive alcohol use. Those interested in primary care were more likely to report cannabis use in the past 12 months (AOR, 1.85; 95% CI, 1.14-3.00). We did not identify significant associations between specialty of interest and current cigarette or NPS use in the past 12 months. However, excessive alcohol use was associated with greater career satisfaction (AOR, 1.24; 95% CI: 1.04-1.49), whereas NPS in the past 12 months was associated with poorer career satisfaction (AOR, 0.63; 95% CI: 0.42-0.93). In addition, there was a negative association between NPS use and the ability to handle workloads due to physical (AOR, 0.31; 95% CI, 0.18-0.54) or mental health issues (AOR, 0.46; 95% CI, 0.30-0.71), but not for other substances. We also found significant negative associations between current cigarette use and the perceived relevance of smoking cessation counselling (AOR, 0.48; 95% CI: 0.29-0.80) and alcohol cessation counselling (AOR, 0.42; 95% CI: 0.25-0.70). Conclusions: These findings suggest that specific patterns of substance use in medical students appeared to be significantly associated with some professional outcomes, specialty of interest, and attitudes towards addiction-related clinical practice. Encouraging medical students to practise healthy habits, including minimizing harmful substance use behaviours, could be an important target for improving medical students' health and their patient care.