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, but may be used to refer to any substance tending
to cause cancer. 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 1,2-benzo(a)pyrene. Even traditional
foods such as bracken (in Japan) are sometimes found to be carcinogenic.

Recent reports have implicated Acrylamide in fried foods as a carcinogen.

Carcinogens are also often, but not necessarily, mutagens or teratogens.