E-Cigarettes for Harm Reduction in Smokers With Opioid Use Disorder

Inclusion Criteria: 1. Currently smokes 5 or more CPD 2. Age ≥ 21 years 3. Has a diagnosis of Opioid Use Disorder 4. In OUDTP (buprenorphine or methadone) ≥ 12 weeks via self-report or EHR records 5. Stable methadone or buprenorphine dose for two weeks via self-report or EHR records 6. Interested in reducing combustible cigarette (CC) smoking but not necessarily trying to quit 7. Own a mobile phone or have regular access to a mobile phone. 8. Able to provide an additional contact to improve follow-up rates. Exclusion Criteria: 1. Does not speak English or Spanish 2. Are pregnant or breastfeeding 3. Not able to provide consent 4. Used tobacco products other than CC in the past 2 weeks (e.g., EC, cigarillo) 5. Currently engaged in an attempt to quit CC smoking 6. Reports having severe chronic obstructive pulmonary disease or asthma (i.e., with exacerbation requiring hospitalization or intubation in the prior 6 months) 7. Reports current major depressive or manic episode, current psychotic disorder, past-year suicide attempt or psychiatric hospitalization, or current suicidal ideation with plan or intent.