“…This is a small but growing area. Numerous genes including cytochrome 2A6, which degrades nicotine, genes related to dopamine function (especially monoamine oxidase which is X-linked), as well as opiate GABA and glutamate receptors are involved (Ahijevych, 1999; Becker & Hu, 2008; Bobzean, DeNobrega, & Perrotti, 2014; Enoch, 2003; Enoch & Goldman, 2001; Kreek et al, 2012; Nielsen & Kreek, 2012; Reed, Butelman, Yuferov, Randesi, & Kreek, 2014; Satarug, Tassaneeyakul, Na-Bangchang, Cashman, & Moore, 2006; Seeman, 2009; Tsankova, Renthal, Kumar, & Nestler, 2007). As our understanding of how these genetic influences contribute to the emergence of sex differences in substance use and abuse is marginal, we will not consider this important topic further.…”