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 fumes or dust — mostly at certain jobs or from smoking — is linked to lung cancer. Food is a minor source that the body handles differently than inhaled cadmium.
What cadmium is
Cadmium is a metal recovered mainly as a byproduct of zinc production. It is used in rechargeable batteries, pigments, coatings, and some plastics. Tobacco plants take up cadmium, so cigarette smoke is a notable source.
How people are exposed
Common ways people come into contact with it:
- Working in battery, metal-coating, smelting, or pigment industries
- Tobacco smoke — smokers have roughly double the body cadmium of non-smokers
- Breathing cadmium dust or fumes in enclosed workspaces
- Diet is a smaller source, mainly from certain foods
The cancer connection
Inhaled cadmium is linked to lung cancer. Some studies also suggest possible associations with kidney and prostate cancers, though the evidence for lung cancer is strongest.
The International Agency for Research on Cancer (IARC), the cancer arm of the World Health Organization, places cadmium in Group 1, carcinogenic to humans — the strongest evidence category, meaning there is enough evidence that it can cause cancer in people. In the United States, the National Toxicology Program's Report on Carcinogens lists it as known to be a human carcinogen.
Hazard is not the same as risk
It helps to separate two ideas that are easy to mix up: hazard and risk. When an agency lists cadmium as a carcinogen, it is making a statement about hazard — whether the substance is capable of causing cancer under some conditions. It is not, by itself, a statement about your personal risk, which depends on how much you are exposed to, for how long, and other factors. Two substances in the same group can carry very different real-world risks. The label answers "can it cause cancer?" — not "how likely is it to cause cancer for me?"
How to lower your exposure
- Do not smoke, and avoid secondhand smoke
- Use ventilation and respiratory protection in cadmium industries
- Follow occupational exposure limits and hygiene practices
If you are looking at your overall cancer risk, small, steady steps add up. See our overview of cancer prevention and what raises cancer risk to put any single exposure in context.
The bottom line
Cadmium is a known human carcinogen (IARC Group 1). The most important thing you can do is understand where exposure comes from and take reasonable steps to reduce it, without losing sleep over a single label. Focus your energy on the biggest, most controllable risks in your own life.
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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