CHEMICALS IN TOBACCO. Including: cyanides (poison), ammonia (toilet cleaner), methane (sewer gas), arsenic (poison), toluene (industrial solvent), hexamine (BBQ lighter), cadmium (batteries), DDT (insecticide), formaldehyde (entombing agent), and urea (urine).
http://www.tricountycessation.org/tobaccofacts/Cigarette-Ingredients.html