The short answer
Cadmium is a metal used in batteries and coatings and found in tobacco smoke. Breathing it, mainly at work or from smoking, is linked to lung cancer. Not smoking and workplace controls reduce exposure.
Cadmium is classified as a known human carcinogen (IARC Group 1).
People are mainly exposed by breathing cadmium dust or fumes at work or from tobacco smoke.
It is most strongly linked to lung cancer.
A carcinogen classification describes hazard — whether something can cause cancer — not your personal risk at a given exposure.
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The full explanation.
The simple version
Cadmium is a soft metal used in some batteries, pigments, and coatings. Breathing cadmium dust or fumes is linked to lung cancer. Most of that exposure happens at work. Tobacco smoke is another source. For people who do not smoke, food is the main source.
What cadmium is
Cadmium is a natural element. Tiny amounts sit in air, water, soil, and food. All soils and rocks hold some, including coal and mineral fertilizers. In the United States, most cadmium is pulled out during the production of other metals such as zinc, lead, and copper. It does not corrode easily. Makers use it in batteries, pigments, metal coatings, and plastics.
How people are exposed
Exposure happens mostly in workplaces where cadmium products are made.
- Breathing dust and fumes on the job.
- Swallowing dust from contaminated hands, cigarettes, or food at work.
- Breathing tobacco smoke.
- Eating food that contains cadmium. This is the main source for people who do not smoke.
- Recycling nickel-cadmium batteries, a growing industry.
The cancer connection
Exposure to cadmium compounds at work is linked to a higher risk of lung cancer.
The International Agency for Research on Cancer (IARC) is the arm of the World Health Organization devoted to cancer research. It places cadmium in Group 1, carcinogenic to humans. That is the strongest evidence category. It means there is enough evidence that cadmium can cause cancer in people. The US National Toxicology Program agrees, listing cadmium in its Report on Carcinogens as known to be a human carcinogen.
Hazard is not the same as risk
Hazard and risk get treated as the same word. They are not. Hazard asks whether cadmium can cause cancer under some conditions. Risk asks how likely cancer is for you. That turns on how much you breathe in or eat, for how long, and other factors. Two agents in the same group can carry very different real-world risks.
How to lower your exposure
- Do not smoke, and stay away from tobacco smoke.
- Throw away nickel-cadmium batteries properly. Do not let children play with them.
- If you work with cadmium, use every recommended precaution. Do not carry cadmium dust home on clothing, skin, hair, or tools.
- Follow the workplace controls that OSHA describes.
It helps to see one exposure next to the rest. Read our overview of cancer prevention and what raises cancer risk.
The bottom line
Cadmium is a known human carcinogen (IARC Group 1). Smoking and cadmium work are the exposures that matter most, and both are worth acting on. A label alone is not a forecast for any one person.
Words to know
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Common questions
Does cadmium cause cancer?
Yes. Cadmium is classified as a known human carcinogen, which means there is strong evidence it can cause cancer in people. How much any one person's risk rises depends on how much they are exposed to and for how long.
How are people exposed to cadmium?
Most exposure happens by breathing cadmium dust or fumes at work or from tobacco smoke.
Which cancers are linked to cadmium?
It is most strongly linked to lung cancer.
How can I reduce my exposure to cadmium?
The main steps are not smoking and using workplace controls and protection.
Does a carcinogen label mean I will get cancer?
No. A classification is about hazard — whether cadmium can cause cancer under some conditions — not a prediction that any one exposed person will develop cancer. Your actual risk depends on the amount and length of exposure and other factors.
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Last updated: 2026-08-11Next planned review: 2028-07-05
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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. We do not employ clinicians and do not intend to — our work 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 checked line by line against the sources listed on it. That confirms the sources support what the page says. 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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