Cigarettes and more specifically tobacco smoke are full of chemicals and poisons. As you discovered in our chemicals in cigarettes section tobacco smoke contains over 4,000 chemicals, many of which make smokingharmful. (side pic:- smoker's lung)Lung cancer is directly related to smoking. Over 40 carcinogens have been identified in cigarette smoke. The risk of developing lung cancer is directly related to the number of cigarettes smoked. The change in consumption from unfiltered high tar cigarettes to filtered low tar cigarettes parallels the change in incidence from squamous cell carcinoma to adenocarcinoma. There is a long interval between quitting smoking and elimination of lung cancer risk. Up to 40% of newly diagnosed lung cancer occurs in former smokers.
