Gases | Effect |
| Carbon Monoxide | Impairs oxygen transportation and utilization |
| Hydrocyanic Acid | Ciliotoxin and irritant |
| Ammonia | Ciliotoxin and irritant |
| Acrolein | Ciliotoxin and irritant |
| Acetaldehyde | Ciliotoxin and irritant |
| Formadehyde | Ciliotoxin and irritant |
| Oxides of nitrogen | Ciliotoxin and irritant |
| Nitrosamines | Carcinogen |
| Hydrazine | Carcinogen |
Substances | Effects |
| Tar | Carcinogen |
| Polynuclear Aromatic Hydrocarbons | Carcinogens |
| Nicotine | Stimulant and Depressant |
| Cresol | Cocarcinogen and irritant |
| Naphthylamine | Carcinogen |
| Nitrosonornicotine | Cocarcinogen and irritant |
| Benzo pyrene | Carcinogen |
| Benzo anthracene | Carcinogen |
| Trace metals (nickel, polonium, etc...) Carcinogen | Carcinogen |
| Indole | Tumor accelerator |
| Carbazole | Tumor accelerator |