What smoking and vaping do to your lungs
Both cigarettes and vapes deliver substances to the lungs. The big difference is that cigarettes burn tobacco while vapes heat liquid into an aerosol. Neither exposure is harmless.
Smoking is more harmful overall. Burning cigarettes exposes the lungs and bloodstream to a toxic mixture strongly linked to cancer, COPD, heart disease, and stroke. Vaping generally exposes people to fewer harmful chemicals than cigarette smoke, but vape aerosol is not clean air, and its long-term effects are not fully understood.
1. What happens when someone smokes a cigarette?
A cigarette burns tobacco. The smoke carries particles and gases, including carbon monoxide and numerous cancer-causing chemicals. These travel deep into the lungs and can enter the bloodstream.
Over years, cigarette smoking can damage the tiny air sacs that transfer oxygen into blood, inflame airways, and injure blood vessels. That is one reason smoking is strongly linked to COPD, lung cancer, and cardiovascular disease.
2. What happens when someone vapes?
A vape heats a liquid into an aerosol. It is not simply water vapor. Depending on the device and liquid, the aerosol can contain nicotine, very small particles, volatile organic compounds, metals, flavoring chemicals, and potentially cancer-causing substances.
Nicotine can be highly addictive. Inhaling aerosol may irritate airways, and researchers are still studying long-term effects on lung and heart health. We should not claim that vaping is safe or that its long-term risks are exactly the same as those of cigarettes.
3. Is vaping safer than smoking?
The comparison matters. According to the U.S. FDA, cigarettes and other combustible tobacco products are among the most harmful tobacco products. For an adult who already smokes, switching completely from cigarettes to e-cigarettes may reduce exposure to many harmful chemicals.
That is not an endorsement of vaping for someone who does not smoke. People who don't use tobacco should not start, and vaping is not risk-free. Continuing to smoke cigarettes while also vaping (dual use) does not provide the same risk reduction as switching completely.
4. What about vaping-related lung injury (EVALI)?
EVALI is a serious lung-injury syndrome associated with use of vaping products. Investigations of the 2019 outbreak strongly linked many cases to THC-containing vaping products and the additive vitamin E acetate, especially products from informal sources. Other chemicals could have contributed.
Important: that outbreak should not be presented as proof that every nicotine vape causes EVALI, or that nicotine vaping and cigarette smoking have identical disease risks. Avoid informal or adulterated products, and seek medical advice for new breathing symptoms.
5. What is a practical next step?
If you smoke cigarettes, quitting smoking is one of the most important health changes you can make. Evidence-based options include counseling, nicotine-replacement therapy, varenicline, and bupropion where appropriate. A clinician or quit coach can help choose what fits your situation.
If you vape nicotine and want to stop, a plan for triggers, withdrawal, and support can help. Visit How to start quitting vaping or try CraveKit's free SOS exercise.
Why we wrote this
This guide was inspired by the question in a YouTube Short about vaping versus smoking. We could verify the video's topic, but not its complete spoken transcript. The medical claims above are based on the primary sources linked below, not an unverified video.
CraveKit's free craving tools can help you make a plan. They are not medical treatment or a substitute for professional care.