Genotype-environment correlations and interactions in the etiology of substance abuse and related behaviors.

Although the relevant behavioral genetic literature on substance abuse is limited, findings from this research, as well as from other behavioral genetic studies, strongly suggest that genetic factors exert some influence on substance abuse behavior. Consequently, although there is a need to carefully document the existence and strength of genetic influences, behavioral genetic research in this area needs to address how, rather than just whether, genetic factors influence substance abuse behavior.