Many with direct professional and personal addiction experience feel that individuals with substance use disorder who smoke cigarettes should not attempt to quit at the same time they are addressing their alcohol and drug use problems. Smoking cessation efforts during addiction treatment, they theorize, could distract individuals from focusing on resolving their more immediate alcohol/drug concerns , or might increase stress, triggering alcohol/drug craving and relapse. At the same time, it is important to know which smoking cessation interventions are best for those who do, in fact, want to quit at the same time. This meta-analysis took an empirical look at how individuals with current or former substance use disorder fare in response to various smoking cessation interventions, both in terms of cigarette smoking and substance use outcomes.