Visit 5 (3 Weeks Post-Quit). Expired carbon monoxide (CO) and weight will be measured in a private room to ensure confidentiality. The visit 5 assessment will take approximately 5 minutes to complete. Participants randomized to the CM treatment will receive payment if they self-report continuous abstinence from smoking since the quit date and have an expired CO level of ≤ 6 ppm. Participants who do not attend will be contacted by phone to obtain their self-reported smoking status.