Visit 3 (1 Week Post-Quit). Participants will complete self-report questionnaires on a laptop computer; and expired carbon monoxide (CO) and weight will be measured in a private room to ensure confidentiality. Visit 3 takes approximately 30 minutes to complete. Participants randomized to the CM treatment will receive an additional payment if they self-report continuous abstinence from smoking since the quit day 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.