Poly-Drug and Marijuana Use Among Adults Who Primarily Used Methamphetamine

Abstract This study examines health and legal problems associated with use of commonly reported substances and combinations of substances in a sample of adults with long histories of methamphetamine (meth) use. Data are from a 2009–11 eight-year follow-up interview in an intensive natural history study (N = 373). Respondents who had not used illicit substances in the year preceding the follow-up interview (38%) were compared to users of marijuana-only (16%), meth-only (7%), and poly-drug users who used meth + marijuana but not heroin or cocaine (19%), and poly-drug users who used heroin and/or cocaine (20%). Multinomial regression results indicate that compared to drug-abstinent individuals, greater depressive symptomatology was reported for poly-drug users of meth + marijuana (p = .001), and arrest rates were higher for poly-drug users who used heroin/cocaine (p = .006); no differences in health, mental health, or criminal involvement were observed for meth-only users compared to abstinent individuals. U...