Recruitment, Eligibility, and Randomization
arrhythmia, dementia, bipolar disorder, manic depression, schizophrenia
ARRHYTHMIA, HEART ATTACK
Participants were recruited through social media ads and screened for eligibility by phone. Individuals were eligible if they met the following criteria: 18 years of age or older; could read and speak in English; smoked at least 100 lifetime cigarettes; smoked in the past week; smoked at least ten cigarettes a day; wanted to quit smoking someday, but not in the next month; reported daily smartphone use; self-reported they could read text on their phone screen; were willing to download and install the app; and used either an Android or Apple smartphone. Individuals were excluded if they reported a lifetime history of dementia, manic depression (bipolar disorder), schizophrenia, contraindications for NRT use (pregnant, nursing, recent heart attack, or uncontrolled arrhythmia); another member of their household was already enrolled in the study; or if we were unable to verify the validity of their phone number or email address.After completing the baseline survey and being randomized, participants were instructed on how to install the app and access their assigned intervention (EC vs SC). Those who failed to install the app within 3 days were offered assistance. Those who failed to install the app during the 3-month study period were excluded from the analytic sample, ensuring evaluative feedback was only collected from individuals who installed the app.