Tar - a thick black liquid obtained through the destructive distillation of an organic substance and is the chief cause of several types of cancer

Carbon Monoxide - a colorless, odorless, toxic gas that is a major contributor to a cigarette smoker's risk of cardiovascular disease

Nicotine - a toxic substance used in insecticide; found in tobacco products; one of the addictive components in tobacco

Over 4,000 other chemicals that include: formaldehyde, ammonia, chloride, benzene, arsenic, acetone, hydrogen, cyanide, etc.