Residential treatment for substance use disorders (SUD) provides opportunity for smoking intervention. A randomized controlled trial compared: (1) Motivational Interviewing (MI) to Brief Advice (BA), (2) in one session or with two booster sessions, for 165 A trained research therapist determined eligibility and diagnosis. Patients were eligible if they met current AD criteria (see 2.4.3), smoked at least 10 cigarettes per day for the past 6 months, and were not using nicotine replacement or bupropion. Patients were excluded if they were psychotic, actively suicidal, terminally ill, cognitively impaired (unable to understand informed consent when tested on comprehension; none excluded for this), or could not read. Recruits were told the study would provide “informational sessions about smoking” without requiring cessation.