Despite differences in the relative magnitude of E influences on variance in cannabis and cigarette use and, importantly, across racial/ethnic groups, the degree to which these factors influenced covariance between the two substances did not vary across EA and AA women. About 23–44% (Table 4) of the individual specific environmental variance in cannabis and cigarette use was shared. Thus, while the magnitude of person-specific influences differed for each substance, the qualitative nature of those influences was similar across them.
