Private space second-hand smoke exposure and the mental health of non-smokers: A cross-sectional analysis of Canadian adults

► We examine associations between SHS exposure and poor mental health in non-smokers. ► Exposure to SHS was measured in the respondents home and vehicle. ► SHS exposure was associated with anxiety, poor/fair mental health, and high stress. ► Associations were contextualized by gender, physical health, and smoking status.