http://www.care2.com/greenliving/the-shocking-ingredients-in-cigarettes....

f you think cigarettes are simply dried tobacco leaves rolled in paper, you’re about 597 ingredients off. The tobacco industry has become master mixologists with the additives. Some ingredients are added for flavor, but research has shown that the key purpose of using additives is to improve tobacco’s potency resulting in increased addictiveness–and the additives they choose to use are dreadful.