We found two studies that examined past-year prevalence of co-use and co-morbidity of alcohol with nicotine and illicit drugs (10 classes including cannabis) among ethnic groups using NESARC-I data27,28. Past-year alcohol use was 74.3% in Whites, 70.0% in Hispanics, 66.5% in Native American, and 61.5% in Asian. Co-use of alcohol with nicotine was 34.0% in Native Americans, 29.4% in Whites, 24.8% in Blacks, 20.6% in Hispanic, and 18.1% in Asians, which indicates past-year nicotine use in 51.9% of Native American, 39.6% of White and Black, and 29.4% of Asian and Hispanic alcohol users27. Co-use of alcohol with drugs was 9.0% in Native Americans, 7.9% in Blacks, 7.4% in Whites, 5.5% in Hispanic, and 5.1% in Asians; this indicates drug use in 13.7% of Native American, 12.6% of Black, 10.0% of White, 8.3% of Asian, and 7.9% of Hispanic alcohol users28. When examining DSM-IV use disorders, past-year comorbidity of AUD with nicotine dependence was 7.0% in Native Americans, 4.6% in Whites, 3.2% in Blacks, 3.1% in Asians, and 2.2% in Hispanics; this indicates nicotine dependence in 45.6% of Asians, 44.0% of
