This project aims to enhance the scalability of an office-based smoking cessation treatment protocol for veterans with PTSD, integrated care (IC), by adapting it to be delivered over the telephone and to incorporate mobile technology components. Mobile technology components include: (1) the Stay Quit Coach (SQC) mobile application (app), and (2) the iCO mobile Smokerlyzer, a smartphone-compatible carbon monoxide monitor. Eighty U.S. military veteran smokers with PTSD, ages 18-39, will be randomized to receive either: (1) the telephone-and technology-facilitated intervention (n=40), or (2) the current standard of care (referral to the VA telephone Quitline) (n=40) as a control. All participants will receive a baseline (Week 0) office visit and will optionally be prescribed nicotine replacement therapy (NRT). Participants in the intervention condition will receive eight 20- to 30-minute telephone counseling sessions and be asked to use the SQC app and iCO Mobile Smokerlyzer. Control participants will receive up to eight weekly proactive telephone sessions through the VA telephone Quitline. Assessments will occur at baseline (Week 0), treatment end (Week 8), and at three months (Week 12) and six months (Week 24) post-randomization. The primary aims of this pilot randomized controlled trial are: (1) to assess the feasibility and acceptability of the intervention; and (2) to assess the impact of the adapted IC intervention on treatment retention compared to treatment as usual (i.e., VA Quitline).