“…Similarly, glucose metabolism is decreased in frontal regions of ALC and cocaine dependent individuals (Adams et al, 1993; Dao-Castellana et al, 1998; Volkow et al, 1992a, 1992b, 1994; Wang et al, 1993). In alcoholism, both chronic alcohol and tobacco use are associated with altered perfusion: higher alcohol consumption is associated with lower frontal and parietal perfusion (Kuruoglu et al, 1996; Melgaard et al, 1990; Nicolas et al, 1993), and greater cigarette smoking severity is associated with lower frontal and/or parietal perfusion in smoking ALC (sALC) (Gazdzinski et al, 2006; Mon et al, 2009), but see (Sullivan et al, 2013). These reductions in regional blood flow and glucose metabolism are of functional importance as they are associated with relapse to drinking within the first year after treatment (Durazzo et al, 2010a) and poorer neurocognition in cocaine dependence (Browndyke et al, 2004; Goldstein et al, 2004, 2001; review by Hanlon et al, 2013) and in alcohol dependence (Adams et al, 1993; Dao-Castellana et al, 1998; Goldstein et al, 2004; Melgaard et al, 1990; Nicolas et al, 1993; Wang et al, 1993), although with some contradictions (Demir et al, 2002; Gazdzinski et al, 2006; Mon et al, 2009).…”