We found two studies examining co-use and comorbidity of DSM-IV DUDs with other addictions among ethnic groups. In NESARC-I, past-year comorbid AUD and DUD was highest in Native Americans at 3.5% and lowest in Asians at 0.7%, with Whites, Blacks, and Hispanics in between at 1.1%55. In the 2005–2007 NSDUH, of those who had a past-year DUD, 87% also had an AUD, including 89% of Hispanics, 88% of Whites, and 78% of Blacks14. Nine percent of those with a DUD had both AUD and cannabis use disorder, including 14% of Blacks, 9% of Hispanics, and 8% of Whites, which indicates that 18.6% of Blacks, 9.9% of Hispanics, and 8.9% of Whites with a past-year AUD also had a cannabis use disorder14.
