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Vaping and Cancer Risk: What the Evidence Shows

By Know Your Vape · · Updated

Contents

Vape aerosol contains some chemicals known to cause cancer, but there is not yet good human evidence showing how much vaping raises cancer risk. Most of the research so far comes from cell and animal studies or from biomarkers, not from people diagnosed with cancer.

What is clear: vaping exposes users to far fewer toxicants than smoking, yet it is not risk-free. It is only a reasonable option for adults who smoke and switch completely. Non-smokers, anyone under 21, and pregnant people should not vape.

What is Vaping?

Explanation of vaping and e-cigarettes

Vaping means inhaling an aerosol made by an electronic cigarette, also called an e-cigarette or vape. The device heats a liquid (e-liquid or vape juice) that usually contains nicotine, flavorings, propylene glycol, vegetable glycerin, and other chemicals.

E-cigarettes do not burn tobacco, so they produce no smoke. A battery powers an atomizer, where a metal coil heats e-liquid soaked into a wick, usually cotton.

Devices range from disposables to refillable pods and larger adjustable kits. Many contain high levels of nicotine, which is highly addictive.

Scientists still have much to learn about the long-term effects of vaping, as the CDC's overview of vaping health effects notes.

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What Research Says About Vaping and Cancer

Research and studies on the link between vaping and cancer

A 2025 systematic review of 39 studies found substantial evidence that vaping is associated with biomarkers linked to cancer risk. Still, the authors concluded that the overall evidence on vaping and cancer risk is limited.

Most of those studies used cells or animals. The few human studies did not find a significant lung cancer risk in vapers who had never smoked, though cancer usually takes decades to develop.

Chemicals and toxins found in e-cigarettes

The CDC says vape aerosol can contain cancer-causing chemicals, heavy metals such as nickel, tin, and lead, ultrafine particles, and volatile organic compounds.

The National Academies found substantial evidence that some chemicals in the aerosol, such as formaldehyde and acrolein, can damage DNA. Whether real-world exposure levels are high enough to cause cancer has not been determined.

Nicotine is highly addictive, but it is not considered the main cause of cancer from tobacco. The cancer concern with smoking comes mostly from the thousands of chemicals in burning tobacco.

Vape aerosol generally contains fewer harmful chemicals than cigarette smoke. Fewer is not zero, and long-term studies in people are still needed.

Types of Cancer Associated with Vaping

Researchers are studying several cancers in connection with vaping. For each one below, the honest answer today is that human evidence is limited.

Lung Cancer

Smoking is the leading cause of lung cancer. For vaping, the few human studies so far have not found a significant lung cancer risk in never-smokers, and animal evidence suggests long-term use could raise risk.

Because lung cancer takes many years to appear, it is too early to rule out a link. Former smokers who vape still carry risk from their smoking history.

Oral Cancer

The mouth and throat are directly exposed to vape aerosol. That makes oral cancer a reasonable concern to study, but no human studies have shown that vaping causes it.

Regular dental checkups can help catch problems in the mouth early, whatever the cause.

Bladder Cancer

Some chemicals absorbed from tobacco products leave the body through urine, which is why smoking raises bladder cancer risk. A cross-sectional study in the 2025 review found no significant association between vaping and bladder cancer.

Pancreatic Cancer

Smoking is a known risk factor for pancreatic cancer. There is no human evidence yet that vaping causes pancreatic cancer.

Claims that vaping has been "linked" to this cancer are not supported by current research.

Other Health Risks of Vaping

Cancer is not the only concern. Vaping has other effects that are better documented.

Respiratory Issues

The National Academies found moderate evidence of more coughing and wheezing in adolescents who vape. Whether vaping causes long-term lung diseases such as asthma or bronchitis in people has not been established.

A 2019 outbreak of serious lung injury (EVALI) was strongly linked to vitamin E acetate in THC vaping products, mostly from informal sources.

Cardiovascular Problems

Nicotine raises heart rate and blood pressure shortly after use. Long-term effects on heart disease and stroke from vaping are not yet known.

Nicotine Addiction

Most vapes contain nicotine, which is highly addictive. Withdrawal can cause irritability, trouble sleeping, and trouble concentrating.

For adults who smoke, switching completely to vaping reduces exposure to many toxicants. Using both (dual use) does not deliver that benefit.

Regulatory Measures and Warnings

In the US, the FDA has regulated e-cigarettes as tobacco products since 2016. New products must pass premarket review, and the FDA keeps a list of authorized products.

Under the federal Tobacco 21 law signed in December 2019, it is illegal to sell e-cigarettes or e-liquids to anyone under 21.

In the European Union, the Tobacco Products Directive limits nicotine strength, bottle and tank sizes, and advertising for e-cigarettes.

Health agencies agree on the main message. The FDA says there is no safe tobacco product, and no e-cigarette is FDA-approved as a quit-smoking aid.

Tips for Quitting Vaping

Quitting nicotine is hard, but support improves your odds. The healthiest long-term choice is to stop using nicotine products altogether.

Supportive Resources and Programs

  1. Free coaching: Call 1-800-QUIT-NOW for free support from trained coaches.
  2. Counseling: Counseling combined with medication gives the best chance of quitting, according to the CDC.
  3. Nicotine replacement therapy: Patches, gum, and lozenges can ease withdrawal. Ask a doctor or pharmacist which fits your nicotine use.
  4. Apps and texting programs: Smokefree.gov offers free texting programs and the quitSTART app.

Strategies for Overcoming Nicotine Addiction

  1. Set a quit date: Pick a specific day and plan for it.
  2. Identify triggers: Notice the situations, moods, or places that make you want to vape, and plan around them.
  3. Replace the habit: Keep your hands and mind busy with exercise, a walk, or a hobby when cravings hit.
  4. Manage stress: Try slow breathing or other relaxation methods, since stress is a common trigger.
  5. Expect setbacks: A slip is not failure. Restart your plan and keep going.

Conclusion

Vape aerosol contains some cancer-causing chemicals, and lab studies raise real concerns. But human evidence on vaping and cancer is still limited, and no type of cancer has been proven to be caused by vaping.

Smoking remains far more dangerous. Adults who smoke and switch completely cut their exposure to many carcinogens, while non-smokers and young people should not start vaping at all.

For more information on the dangers of vaping and its impact on health, please visit the following links:

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