“…Psychopathic individuals have frequently been characterized as impulsive and irresponsible risk takers, with an altered sensitivity to reward and reward-related stimuli ( Cleckley, 1941 ; Mitchell et al, 2002 ; Hare, 2003 ; Ross et al, 2007 ; Wallace et al, 2009 ; Morgan et al, 2011 ; Hopley and Brunelle, 2012 ; Beszterczey et al, 2013 ; Dean et al, 2013 ; Salim et al, 2015 ). Given that these are also characteristics that predict initial and prolonged drug use ( Woicik et al, 2009 ; Koob and Volkow, 2010 ; Dissabandara et al, 2014 ; Leeman et al, 2014 ), it may come as no surprise that psychopathy has been associated with heightened levels of substance use ( Kennealy et al, 2007 ; Coid et al, 2009 ; Hillege et al, 2010 ; Cope et al, 2014 ; Hawes et al, 2015 ), as well as increased diagnosis of both substance abuse ( Hemphill et al, 1994 ; Mailloux et al, 1997 ; Cauffman et al, 2009 ; Sylvers et al, 2011 ; Jones and Miller, 2012 ; Colins et al, 2015 ) and substance dependence ( Hart et al, 1991 ; Hemphill et al, 1994 ; Walsh et al, 2007 ; Hopley and Brunelle, 2012 ).…”