E-cigarette use and beliefs among adult smokers with substance use disorders

•We estimated prevalence of e-cigarette dual use among smokers with substance use disorders.•Dual e-cigarette users were more likely to have tried to quit in the past year.•Overall, participants preferred to use e-cigarettes in comparison to nicotine patches/gum.•E-cigarettes seem appealing to patients with substance use disorders.•E-cigarette use may be effective for harm reduction among patients in addiction treatment.