“…Adolescents may be susceptible to being exposed to SHS from several sources, including at school, in private cars, and at home, especially in the absence of smokefree rules (Cartmell et al, 2011;King, Dube, & Tynan, 2012;Olufajo & Agaku, 2014). The degree of overall SHS exposure among nonsmoking adolescents could reflect underlying exposure to different behavioral, environmental, and social pro-tobacco influences, such as living with a smoker or having smoking friends-factors which have been shown to predict smoking among youths (US Department of Health and Human Services, 2012).…”