Wikipedia: Carcinogen

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Carcinogens are substances that cause cancer. Generally, the term refers to agents that have been introduced by human means. DDT, Kepone, EDB, and asbestos have all been classified as carcinogenic. Tobacco has also been identified as a carcinogen.

Carcinogens are chemical substances that modify genome of cells to promote
cancer transformation. Generally, the term refers to agents that have been
introduced by human means. DDT, benzene, kepone?, EDB, and Asbestos have all been
classified as carcinogenic. Tobacco has also been identified as a rich
source of hundreds of carcinogens like 3,4-benzpiren.

*see also toxicology
*external link [U.S. report on carcinogens]

Carcinogens are chemical substances that modify genome of cells to promote cancer transformation. Generally, the term refers to agents that have been introduced by human means. DDT, benzene, kepone?, EDB, and Asbestos have all been classified as carcinogenic. Tobacco has also been identified as a rich source of hundreds of carcinogens like 3,4-benzpiren.

see also toxicology
external link [U.S. report on carcinogens]