599 additives are on the composite list released to the government in 1994 by tobacco companies of what may be added to cigarettes. This list includes all ingredients that are used although it does not tell which companies they are used by or which brands they are used in. 2-Naphthylamine, 4-Aminobiphenyl, Benzene, Vinyl Chloride, Ethylene Oxide, Arsenic, Beryllium, Nickel, Chromium (only hexavalent), Cadmium, and Polonium-210 are human carcinogens found in tobacco smoke.
"Smoking and Tobacco Control." U.S. Department of Health and Human Services, Public Health Service, National Institutes of Health, National Cancer Institute. Bethesda, MD. Risks Associated with Smoking Cigarettes with Low Machine-Measured Yields of Tar and Nicotine. 19 Nov. 2001: 176-80.
http://cancercontrol.cancer.gov/brp/tcrb/monographs/13/m13_complete.pdf