This study is testing a new smartphone app called "Smiling instead of Smoking" (SiS) to help people who smoke less than daily quit. The SiS app uses positive psychology exercises and tools to help you quit. You would use this app or another app called "QuitGuide" from the National Cancer Institute (NCI). We want to see if the SiS app helps people quit smoking and how it affects their attitudes toward smoking, urges, and overall well-being. You can join if you are 18 or older, smoke less than daily but at least weekly, have smoked 100+ cigarettes in your lifetime, want to quit, and own a smartphone. Success in this study means you report not smoking for 30 days.

Study design

This is a large study with 1,600 participants. It's a randomized clinical trial, meaning you'll be randomly assigned to use either the SiS app or the QuitGuide app.

What's involved

You will use the assigned app for 7 weeks, starting one week before your chosen quit date. You will also complete online surveys at the start and at 2 weeks, 6 weeks, 3 months, 6 months, and 12 months after your quit date.

Compensation

Not stated in the trial record.

Follow-up

You will be followed for 12 months after your chosen quit date, with surveys at 2 weeks, 6 weeks, 3 months, 6 months, and 12 months.

AI-generated from the public study record. Only the study team can confirm whether you're eligible — confirm details with them before making decisions.