“…For example, in 2012–2013, among combustible tobacco users, only about half (53.7%) reported smokefree homes and about one-third (34.2%) reported smokefree vehicles Kruger, et al, 2015). Presence of a young child in the home may attenuate this disparity (Berg, Lessard, et al, 2011; Nabi-Burza, et al, 2012; Ossip, et al, 2013), though at least one study found that presence of children was not associated with smokefree vehicles (Cheng, et al, 2015). Lower rates of smokefree home and/or vehicle policies have also been found for younger adults (ages 18–24; King, et al, 2013; Cheng, et al, 2015) relative to older groups, those with lower (vs. higher) education levels (Cheng, et al, 2015; King, et al, 2013; Kruger, et al, 2015), and those of lower (vs. higher) socioeconomic status (King, Hyland, Borland, McNeill & Cummings, 2011).…”