This study aims to develop a Mindfulness Smartphone Intervention with Contingency Management (MSI-CM) for smoking cessation that can be readily available to depressed smokers receiving outpatient psychiatric treatment. This project is expected to result in the development of an effective intervention that will produce preliminary data showing increased short-term cessation success in depressed smokers receiving outpatient psychiatric treatment. It is anticipated that this smoking cessation intervention will have potential for broad reach to outpatient psychiatric treatment programs and have a significant overall impact in reducing smoking-related morbidity and mortality by enhancing smoking cessation rates in at-risk populations.