“…Unfortunately, these drugs also retain a liability for abuse and dependence, especially in polydrug users and individuals with comorbid anxiety and depression (Woods et al, 1992;Griffiths and Weerts, 1997;Licata and Rowlett, 2008). Interestingly, benzodiazepine abuse is more likely to occur in smokers (Dunbar et al, 1988;Lekka et al, 1997;Neutel, 2005), and evidence from rodents shows that exposure to nicotine increases the reinforcing properties of benzodiazepines (White, 1989;Irvine et al, 2001;James-Walke et al, 2007). Like nicotine, benzodiazepine reinforcement involves midbrain GABAergic signaling, as genetic manipulation of GABA A Rs in the VTA was shown to decrease benzodiazepine consumption (Tan et al, 2010;Tolu et al, 2013).…”