Clinical Learning Study for a Mobile Smoking Cessation Program

Inclusion Criteria: * Signed informed consent. * Age 18 and older. * For cigarette smokers: Smokes at least 5 cigarettes a day. For dual-users: Smokes cigarettes AND uses e-cigarettes, with the following additional criteria: * Smokes at least 5 cigarettes a day * Vaping sessions, when they occur, must be for at least 10 minutes (15 puffs) * Fluent in written and spoken English (confirmed by ability to read and comprehend the informed consent form) * Lives in the United States. * Is the solo user of an iPhone with iPhone operating system (iOS)13 or greater capabilities or a smart phone with an Android operating system (OS) 9 or greater capabilities. * Has an active email address. * Willing and able to receive SMS text messages on their smartphone and email messages. * Have access to internet connection during the study duration. * Able to confirm download of installed DTx on baseline date. * Willing and able to comply with study protocol and assessments. * Is willing and able to self-identify sessions of cigarette smoking (1 or more consecutive cigarettes) or vaping (approximately 15 puffs or around 10 minutes in duration) and log those sessions. * Self-reported comfort with and ability to use smartphone apps/programs. Exclusion Criteria: * Prior use of Clickotine. * Currently using a software app for smoking cessation. * Lifetime diagnosis of schizophrenia, psychotic disorder, or pervasive developmental disorders, as per participant self-report. * Any unstable medical illnesses including hepatic, renal, gastroenterological, respiratory, cardiovascular, endocrine, neurologic (including history of severe head injury with loss of consciousness), immunologic, or hematologic disease, as per participant self-report. * Other significant medical condition that, in the opinion of the Investigator or study sponsor, may cofound the interpretation of device efficacy, safety, and tolerability. * Current use of tobacco-containing products other than cigarettes or e-cigarettes (e.g. snuff, chewing tobacco, cigars, or pipes). * Does not have or is unwilling to create a PayPal account