Cigarette use was more common in EAs (75.3%) relative to AAs (64.2%) while cannabis use was marginally, but significantly, more commonly reported by the AA (55.5%) than the EA (52.4%) participants. Cigarette use (mean age at onset ~14 years) typically preceded cannabis use (mean age at onset ~17 years) in both racial/ethnic groups (see Table 1). As shown in Table 1, 50.3 and 46.4% of EA and AA participants respectively reported using both substances. While a fair proportion of women reported cigarette use alone (25.0 and 17.8% for EA and AA respectively), cannabis use in the absence of cigarette use was uncommon but more prevalent in AA (9.3%) relative to EA (2.1%) women. Reverse gateways (i.e., onset of cannabis use before the onset of cigarette use, by at least one year) were uncommon in general, however AA women (23.5%) were more likely than EA women (5.4%) to endorse this pattern of onsets.
