GreytoWhite Posted October 5, 2012 chi 2012, anything that is burned can cause cancer and the heat introduction to lungs is a major contributor as well. In the processing of tobacco a lot of ammonia, nicotine, and other chemicals leech out of the tobacco. Cigarette companies collect these chemicals as well as add their own proprietary blend and reapply it to processed leaf. There are also tobacco by-products (usually rolled stems and cuttings too that are too small for the machine) that are added to a normal cigarette. These tobacco by-products burn very quickly due to lack of density and other processing. Natural American Spirit is owned by big tobacco just like the others but it is higher quality material. They burn longer because there is no filler added and the processing is more traditional. Still, there is MORE tobacco resin in the Natural American Spirit cigarettes. There are no additives but they are still something to avoid, tobacco is not meant to be inhaled. Share this post Link to post Share on other sites