“…Recent evidence offers indirect empirical support for this hypothesis. Cross-sectional data suggest that youth who use alternative tobacco products exhibit fewer psychosocial risk factors (e.g., sensation seeking) and mental health problems other than ADHD (e.g., substance use, anxiety, depression) than adolescents who smoke combustible cigarettes (Wills, 2017;Leventhal et al, 2016). Comparisons between youth poly-product users (e.g., use of e-cigarettes and combustible cigarettes) and youth who use a single product have found that poly-product users exhibit greater levels of some mental and behavioral health outcomes (e.g., marijuana use) but not others (e.g., anxiety and depression; Leventhal et al, 2016).…”