Screening and Baseline Assessment (Visit 1). Individuals attending the orientation visit of the Tobacco Treatment Research Clinic (TTRC) will be provided with detailed information about the study and given the opportunity to have their questions answered within a private room to ensure confidentiality. Study staff will review the consent form with interested participants, and they will be screened for eligibility on-site in a private room in the clinic. Participants will be questioned about their 1) age, 2) current level of smoking, 3) willingness to quit smoking, and 4) willingness/ability to attend 4 sessions (including the first visit). Participants will be randomized to treatment as usual (TAU), QuitGuide, or Smart-T groups and advised of their group assignment. Participants will complete the assessment portion of visit 1. Participants will complete self-report questionnaires on a laptop/tablet computer; and weight, and height will be measured in a private room to ensure confidentiality. Participants will be loaned an Android smartphone and instructed regarding the use of the phone as well as the ecological momentary assessment (EMA) procedures.