A cigarette includes an ignition element in contact with tobacco, surrounded by a composite outer wrapper. The outer wrapper is impervious to oxygen causing the tobacco to extinguish between puffs. The ignition element, however, has a longer static burn time than the tobacco and remains smoldering between...http://www.google.fr/patents/US6823873?utm_source=gb-gplus-shareBrevet US6823873 - Cigarette having reduced sidestream smoke
