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Noncombustible Nicotine Delivery Systems as Potential Harm Reduction Tools for Persistent Cigarette Smokers
What is vaping, and why is it studied?
Vaping means inhaling aerosol from an e-cigarette, which heats a liquid usually containing nicotine, flavorings, and carriers like propylene glycol. Most devices sold today are disposables, and the nicotine in one can equal a pack of cigarettes or more. Nicotine is highly addictive, and teen brains are especially sensitive to it. In 2024, 5.9 percent of middle and high school students vaped, down from over 20 percent in 2019, while young adults 18 to 25 vape the most of any age group, about 14 percent. About 6.5 percent of US adults vaped in 2023, many of them current or former smokers.
Vaping is likely less harmful than smoking, which is why some adults use it to switch, and the FDA has authorized a small number of e-cigarette products on that basis. But less harmful is not harmless: the aerosol contains ultrafine particles, metals, and lung irritants, and since vaping is only about 15 years old, its long term effects on cancer and heart disease are still unknown. No medication is yet approved to help people quit vaping, though cytisinicline has a separate research program for it, and behavioral support like text based quit programs has the best evidence so far for teens. Clinical trials are working on both gaps right now.
Vaping is a form of nicotine addiction; for cigarette smoking, see our smoking cessation studies, and for lung effects, see asthma and COPD research.
Types of vaping clinical trials
Quit vaping trials. The largest group. Studies test medicines used for smoking (varenicline, nicotine replacement, bupropion) in people who vape, new drugs like cytisinicline, and text message, app, and counseling programs, often in teens and young adults specifically.
Health effects studies. Research measuring what vaping does to the lungs, heart, blood vessels, and immune system, often comparing people who vape, people who smoke, and people who do neither. Some enroll healthy young adults for a single visit with breathing tests and blood work.
Switching studies. Trials testing whether adults who smoke and switch to vaping reduce harm, and what happens to their health markers over time.
Product and nicotine studies. Research on how flavors, nicotine strength, and device type affect use and dependence, including studies of nicotine pouches, which became the second most used tobacco product among youth in 2024.
Prevention and youth studies. School and community programs to prevent young people from starting, and studies of how advertising and social media shape use.
Observational studies. Following people who vape over years to answer the long term questions nobody can answer yet. No treatment is given, and eligibility is usually broad.
Who can participate in vaping clinical trials?
Vaping studies sort people mainly by age and by what they want. Quit vaping trials enroll people who currently vape nicotine and want to stop, and many are built for teens and young adults, with parental consent required under 18. Health effects studies often enroll people who vape regardless of whether they want to quit, plus comparison groups of smokers and non users. Switching studies enroll adults who smoke cigarettes. Some trials exclude people who also use other tobacco products, and medication trials exclude certain health conditions. Eligibility always varies by study.
How long does it take for your lungs to heal from vaping?
Nobody knows precisely. Coughing, chest tightness, and shortness of breath often improve within days to weeks of stopping, and lung irritation measures improve over months. Whether any long term damage occurs, and how much reverses, is exactly what health effects studies are trying to establish. The honest answer is that the body starts recovering quickly and the full picture is still being researched.
Is there compensation for taking part?
Some studies offer compensation for time and travel, and study related care is typically provided at no cost as part of a clinical trial. Compensation varies by trial and is always described during the informed consent process before you agree to anything.
Curious whether clinical trials pay participants? Here's how compensation actually works.
How to find and enroll in a vaping clinical trial
Identify your study. Use the filters to search vaping or e-cigarettes. Titles usually say whether the study is about quitting, health effects, or switching, and which age group it enrolls.
Check the setting. Many quit vaping studies run largely by phone, text, or app, with medicine mailed to you; health effects studies usually need one or more in person visits for breathing tests.
Complete the health profile. Click "Get started" to begin the 5-step application. Have three things ready: how often you vape and for how long, whether you also smoke or use other nicotine products, and whether you want to quit or are joining a health effects study. For anyone under 18, a parent or guardian completes the application.
Submit the application. A study coordinator reviews it and contacts you. Nothing is decided until you have gone through informed consent, and participation is voluntary at every step.