Inclusion Criteria:  ≥ 18 years of age report being smokers at the time they learned of the current pregnancy report smoking in the 7 days prior to completing their preliminary eligibility screening < 25 weeks pregnant speak English own a smartphone (Android or iOS) self-report as an Alaska Native current smoker as verified by saliva cotinine test  Exclusion Criteria:  current or prior mental or medical condition that may interfere with study participation smoke marijuana more than once each week and not willing to quit (marijuana smoking can inflate breath CO) exposed to unavoidable occupational sources of CO (e.g., car mechanic) report currently receiving opioid maintenance therapy (e.g., methadone, buprenorphine)