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Smoking and cancer: What's in a cigarette?
Cigarettes, including low-tar brands, contain dozens of cancer-causing chemicals. A cigarette may look harmless enough - tobacco leaves covered in white paper. But when it burns, it releases a dangerous cocktail of over 5,000 chemicals including:
many chemicals known to cause cancer
hundreds of other poisons.
nicotine, a highly addictive drug
and many additives designed to make cigarettes taste nicer and keep smokers hooked.
Some of these chemicals, like nicotine, are found naturally in the tobacco plant or absorbed by the plant from the soil, air and fertilisers (such as metals and polonium-210).
Other chemicals, including nitrosamines and polycyclic aromatic hydrocarbons, are formed when the tobacco leaves are processed or burnt. This is all before the tobacco industry add the hundreds of other chemicals to cigarettes.This is why there is no safe way to use tobacco.
This page has information on the various poisons in cigarette smoke. To learn more about the impact of these chemicals in the body, see our How smoking causes cancer page.
Some cancer-causing chemicals in tobacco smoke and their other common uses
Tar - a mixture of dangerous chemicals
Arsenic - used in wood preservatives
Benzene - an industrial solvent, refined from crude oil
Cadmium - used in batteries
Formaldehyde - used in mortuaries and paint manufacturing
Polonium-210 - a highly radioactive element
Chromium - used to manufacture dye, paints and alloys
1,3-Butadiene - used in rubber manufacturing
Polycyclic aromatic hydrocarbons - a group of dangerous DNA-damaging chemicals
Tobacco-specific nitrosamines - a group of carcinogens only found in tobacco
Acrolein - used as a chemical weapon in World War 1 - and acetaldehyde - used in the industrial production of acid
etc
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