The ingredients of the cigerattes are tobacco, paper, filter materials and additives. There may be pesticides, fertilisers and fumigants and other stuff. Additives are used to improve the look and feel of cigerettes to make them last longer or to make them less likely to go bad when they are getting shipped. They are also used to make the product more better; for example to taste better. They are also used for more bad things like increasing the addictiveness of nicotine, or making it easier to learn to smoke. By increasing the goodnesss, or bad additives that are suppose to make it safe can lead to more smoking and therefore cause much more harm than the little bit of the chemical additive causes itself. They say "smoke has over 4,000 chemicals in it. There may be 4,000 have been identified in smoke, but; there might be some chemicals that we dont know about.