“…Evidence suggests that socioeconomic differences in health behaviour account for up to half of the socioeconomic health gradient (Mokdad, Marks, Stroup, & Gerberding, 2004;Stringhini et al, 2010). People of lower SEP are more likely to smoke or to drink excessively than those of higher SEP (Harrell, Bangdiwala, Deng, Webb, & Bradley, 1998;Pridemore, Tomkins, Eckhardt, Kiryanov, & Saburova, 2010), and are less likely to take part in regular physical activity (McLaren, 2007;Wardle, Waller, & Jarvis, 2002). They are also less likely to adhere to treatment programmes, even when there is no financial cost to doing so (Barr, Somers, Speizer, & Camargo, 2002;Goldman & Smith, 2002).…”