Smoking is highly prevalent among individuals with substance use disorder (SUD). No specific treatment policy exists for nicotine dependence treatment (NDT) in patients with SUD in Portugal, such as in most countries.We used the Index of Treatment Quality (ITTQ) and Tobacco Treatment Commitment Scale (TTCS) to assess NDT quality and commitment before and after training professionals who work in the Portuguese SUD treatment network (n = 203). The study assessed learning and competence through pre- and postknowledge tests, competence self-report, and intention-to-change questionnaires. The study carried out descriptive and inferential statistics using STATA software. We based the current study on the Revised Standards for Quality Improvement Reporting Excellence (SQUIRE 2.0).Compared to psychologists, physicians/social workers had worse NDT perceptions (i.e., NDT should not be included in drug treatment programs; NDT could hinder client recovery; it is unfair to take tobacco away from these patients). The counseling offer level was low overall. However, the study found higher levels of smoking assessment in all regions. Knowledge of motivational interviewing, stages of motivation, and addressing return to use improved. Self-competency skills also increased following training.Treatment providers should be encouraged to implement counseling within NDT. Physicians and social workers should be aware of the importance of NDT for individuals with SUD. Attitudes and commitment to NDT for this subpopulation were quite similar to those found in U.S.Our educational intervention increased learning knowledge and competence.