“…The Cigarette Purchase Task (CPT ; MacKillop et al, 2008 ) is based on a model of drug reward assessment that has been successfully used with several drugs including heroin ( Jacobs & Bickel, 1999 ;Petry & Bickel, 1998 ), tobacco ( Jacobs & Bickel, 1999 ;MacKillop et al, 2008 ;Madden & Kalman, 2010 ), and alcohol ( MacKillop et al, 2008 ;Murphy & MacKillop, 2006 ;Murphy, MacKillop, Skidmore, & Pederson, 2009 ). Participants indicated how many cigarettes they would purchase at each of the following 18 prices: 0.01, 0.5, 0.1, 0.3, 0.5, 1,2,3,4,5,6,11,35,70,140,280,560, and 1120 US $ / cigarette.…”