SiS (“Smiling Instead of Smoking”) is an app that engages you in daily positive psychology exercises over the course of 7 weeks, and assigns ‘behavioral challenges’ every 2-4 days to coach you through the steps towards smoking cessation. This is an app designed by scientists based on existing evidence and clinical guidelines regarding smoking cessation [https://www.cancer.gov/publications/patient-education/clearing-the-air]. The effectiveness of this app will be tested, as funded by a grant fr