Socio-demographic characteristics of the study populations are presented in table 1. Rates of nicotine, alcohol, cannabis and alcohol use were higher among males, Whites and AI/AN and US-born individuals. While rates of nicotine and cannabis use were higher among individuals in the youngest age group (18 to 29 years old), rates of alcohol and cocaine use were higher among individuals 30 to 44 years old. Respondents less educated and with an individual income lower than $35,000 reported higher rates of nicotine use. Respondents who completed at least some college education or had an individual income equal or higher than $70,000 reported higher rates of alcohol, cannabis or cocaine use. While divorced/separated individuals reported higher rates of nicotine, alcohol and cocaine use, never married individuals reported higher rates of cannabis use.
