“…Greater severity of dependence has been associated with poorer outcome for group psychotherapy (Kozlowski et al, 1994), bupropion HCl (Dale et al, 2001;Paluck et al, 2006), and nicotine patch (Batra et al, 2008;Westman et al, 1997), as well as in naturalistic settings with no specific treatment (Hymowitz et al, 1997). Other factors, such as self-efficacy/ self-confidence (Gwaltney et al, 2005;Haaga and Stewart, 1992;Li and Froelicher, 2008;Schnoll et al, 2003;Shiffman et al, 2000), desire to quit (Wiggers et al, 2005), low negative affect (Shiffman et al, 2007), absence of depression (Japuntich et al, 2007), little craving response to cues (Waters et al, 2004), low anger (Al'Absi et al, 2007), slow nicotine metabolism (Schnoll et al, 2009), and absence of lapses during early treatment (Kenford et al, 1994) have also been found to predict quit status. Thus, clinical factors have been extensively studied for their value in predicting treatment response, with greater severity of specific symptoms being linked to less likelihood of quitting.…”