Summary table of non-cancer risk indices for individual chemical constituents of mainstream cigarette smoke based on a single cigarette per day
| Non-cancer effects | Smoke constituent | NCRI |
|---|---|---|
| *Reference exposure levels6,11 are intended to protect sensitive individuals against chronic effects over a chronic period of continuous exposure. The NCRI is equal to reported concentrations divided by the REL, assuming an average 20 m3/day breathing rate. Bold numbers indicate an NCRI > 1.0 which signals that the threshold for adverse effects could be reached for some people from smoking a single cigarette per day. | ||
| Respiratory effects | Acrolein | 172* |
| Acetaldehyde | 3.78 | |
| Formaldehyde | 0.83 | |
| Cadmium | 0.52 | |
| Chromium (hexavalent) | 0.26 | |
| Acrylonitrile | 0.22 | |
| Nickel | 0.011 | |
| Ammonia | 0.006 | |
| Cardiovascular effects | Hydrogen cyanide | 1.97 |
| Arsenic | 1.17 | |
| m-+p-Cresol | 0.18 | |
| O–Cresol | 0.071 | |
| Carbon monoxide | 0.068 | |
| Benzene | 0.039 | |
| Phenol | 0.0022 | |