In addition, nearly all prior family and twin studies of cannabis involvement have been conducted in samples of European descent. Two publications utilizing the data analyzed in the present study are amongst the few to document that cannabis use is equally heritable in AA and EA women (Agrawal et al., 2016; Sartor et al., 2009), but that individual-specific environmental influences on cannabis use are more prominent in AAs compared to EAs. Thus, it is possible that the extent to which familial and individual-specific factors influence the correlation between cannabis involvement and childhood maltreatment also differs across racial/ethnic groups.
