The things that are killing you in a cigarette is Methedrine (a chemical to get of fleas on pets), Benzopyrene (This is a chemical which is 1 of the most strongest cancer-causing chemical in the world), nicotine (This is a highly addictive drug and a poison which increases blood pressure and heart rate), Acetone (This chemical is poisonous, it kills off both brain and lung tissue and it is also is an active ingredient in nail polish remover), lead (Lead poisoning stunts your growth, makes you vomit and it also damages your brain),formaldehyde (This also destroys both brain and lung tissue, it causes cancer and it is also used to preserve dead bodies), turpentine (, propylene, butane, cadmium, Nickel carbonyl, ammonia and benzene. the picture across also shows what kills you and tells you a little more about that substance.