According to the U.S. Department of Health and Human Services,[1] the following are known human carcinogens found in cigarette smoke:
| Chemical | Amount (per cigarette) |
|---|---|
| Acetaldehyde | 980 micrograms to 1.37 milligrams |
| Acrylonitrile | formerly 1 to 2 milligrams. This product was used as a fumigant in tobacco. Its use has since been discontinued. |
| 4-Aminobiphenyl | 0.2 to 23 nanograms per cigarette |
| o-Anisidine hydrochloride | unknown |
| Arsenic | unknown |
| Benzene | 5.9 to 75 micrograms |
| Beryllium | 0.5 nanograms |
| 1,3-Butadiene | 152 to 400 micrograms |
| Cadmium | 1.7 micograms |
| 1,1-Dimethylhydrazine | unknown |
| Ethylene oxide | unknown |
| Formaldehyde | unknown |
| Furan | unknown |
| Heterocyclic amines | unknown |
| Hydrazine | 32 micrograms |
| Isoprene | :3.1 milligrams |
| Lead | unknown |
| 2-Naphthylamine | 1.5 to 35 nanograms |
| Nitromethane | unknown |
| N-Nitrosodi-n-butylamine | 3 nanograms |
| N-Nitrosodiethanolamine | 24 to 36 nanograms |
| N-Nitrosodiethylamine | up to 8.3 nanograms |
| N-Nitrosodimethylamine | 5.7 to 43 nanograms |
| N-Nitrosodi-n-propylamine | 1 nanogram |
| 4-(N-Nitrosomethylamino)-1-(3-pyridyl)-1-butanone | up to 4.2 micrograms |
| N-Nitrosonornicotine | 14 micrograms |
| N-Nitrosopiperidine | unknown |
| N-Nitrosopyrrolidine | 113 nanograms |
| N-Nitrososarcosine | 22 to 460 nanograms |
| Polonium-210 | variable, depending on soil and fertilizer used to grow tobacco[2] |
| Polycyclic aromatic hydrocarbons | 28 to 100 milligrams |
| o-Toluidine | 32 nanograms |
| Vinyl chloride | 5.6 to 27 nanograms |