The goal of this quasi-experimental study is to test if a smartphone app can help adolescents aged 14-20 quit e-cigarettes. The main questions it aims to answer are: * Can the app help adolescents manage cravings and increase their readiness to quit? * Does the personalized and real-time support provided by the app improve their success in quitting e-cigarettes? Researchers will compare two groups: an immediate-intervention group that starts using the app right away and a delayed-intervention group that begins after three months, to see if the timing of app access influences outcomes in e-cigarette cessation. Participants will: * Set personal goals and track their daily progress within the app. * Use a real-time "urge" feature that provides immediate support during cravings. * Engage with a chatbot for quick answers and motivational support around quitting. This study aims to create an accessible, personalized tool to help adolescents reduce or quit e-cigarette use, exploring its feasibility as a broader intervention model.
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Timeframe: 30-Day Follow-up