Smartphone Apps for Vaping Cessation: Quality Assessment and Content Analysis.

Background: As the prevalence of electronic cigarette (e-cigarette) use, or vaping, continues to grow, particularly among young people, so does the need for research and interventions to address vaping.

Objective: This study examines the quality of free vaping cessation apps, their contents and features, popularity among users, and adherence to evidence-based principles.

Methods: A systematic search of existing apps for vaping cessation was conducted in December 2020.