Quit2Heal Smartphone App in Helping Cancer Patients Quit Smoking

Inclusion Criteria: * Age 18 or older * Diagnosed with cancer within the past 24 months or currently receiving or planning to receive cancer treatment in the next 3 months * Smoked a cigarette (even a puff) in the past 30 days * Interested in learning skills to quit smoking * Willing to be randomly assigned to either smartphone application * Live in the United States and will remain in the United States (US) for the next 12 months * Have at least daily access to their own smartphone * Know how to download a smartphone application * Be willing and able to read English * Not currently (i.e., within past 30 days) using other smoking cessation interventions * Have never participated in our prior research trials * Have never used the National Cancer Institute (NCI)'s QuitGuide app * Being willing to complete a follow-up survey at 3, 6, and 12 months post-randomization * Providing email, phone number(s), and mailing address Exclusion Criteria: * Currently (i.e., within past 30 days) using other smoking cessation interventions * Has participated in our prior research trials * Has used the NCI's QuitGuide app * Not willing to complete a follow-up survey at 3, 6, and 12 months post-randomization * Not providing email, phone number(s), and mailing address