The short answer
The CDC says e-cigarette aerosol contains cancer-causing chemicals and generally fewer harmful substances than cigarette smoke, but that this does not make e-cigarettes safe.
The CDC says e-cigarette aerosol can contain nicotine, cancer-causing chemicals, volatile organic compounds, and heavy metals such as nickel, tin, and lead.
The CDC says the aerosol generally contains fewer harmful substances than cigarette smoke, but this does not make e-cigarettes safe.
The CDC warns that using e-cigarettes and cigarettes together (dual use) may result in greater exposure to toxins and worse respiratory health outcomes than using either alone.
Nicotine is highly addictive.
On this page
Watch: Does vaping cause cancer?
54 sec · Captioned · What's actually in e-cigarette aerosol — and why long-term risk is unknown.
Also on YouTube.
Educational only — this video explains general report language and is not medical advice. Only your care team can say what a result means for you.
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The whole article, with every detail and caution.
What federal sources say
This page is for people who vape, people thinking about switching from cigarettes, and their families.
The CDC says the mist from an e-cigarette can contain nicotine, cancer-causing chemicals, volatile organic compounds, and heavy metals such as nickel, tin, and lead. It also lists diacetyl, a flavoring linked to a serious lung disease. Nicotine is highly addictive.
The CDC says e-cigarette aerosol generally contains fewer harmful substances than cigarette smoke. It also says this does not make e-cigarettes safe.
Using both
The CDC warns that using e-cigarettes and traditional cigarettes together may result in greater exposure to toxins and worse respiratory health outcomes than using either product alone.
Where this leaves you
If you smoke or vape, your care team can walk you through options for quitting and how they compare. Do not stop or change any cancer treatment on your own. Ask your care team first.
If you develop a cough that will not go, chest pain, breathlessness, or coughing blood, call your care team right away rather than assuming it is from vaping.
Sources
Common questions
Does vaping cause cancer?
This page cannot give you a number for your own cancer risk. The CDC says e-cigarette aerosol contains cancer-causing chemicals and that e-cigarettes are not safe. Ask your care team about your situation.
Is vaping safer than smoking?
The CDC says e-cigarette aerosol generally contains fewer harmful substances than cigarette smoke, but that this does not make e-cigarettes safe. The CDC also warns that using both may lead to greater exposure to toxins than using either one alone.
I vape and I am in cancer treatment. Does that matter?
It is worth telling your team. They can tell you whether vaping affects your treatment and can offer support if you want to stop.
Questions to ask your doctor
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Plain-language explanation of the published sources cited on this page. AI-assisted, source-checked, not clinician-reviewed.
Written by: Cancer ExplainedSources last checked: 2026-10-16 what this meansLast updated: 2026-10-16Next planned review: 2027-07-30
Review details and limits
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status — Source checked. This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
General education — varies by person. Answers genuinely differ between people. This page explains what commonly varies and points you to your care team for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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