| http://www.w3.org/ns/prov#value | - Among non-Hispanic Caucasians who smoked at least one pack of cigarettes per day, had unsuccessfully attempted to stop smoking, and were not dependent on alcohol or other drugs, the DRD2 A1 allele was more prevalent than in controls (Comings et al., 1996), although this is not observed in all studies (Singleton et al., 1998).
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