Cigarettes, cigars, and pipe tobacco are made from dried tobacco leaves, as well as ingredients added for flavor and to make smoking more pleasant. The smoke from these products is a complex mixture of chemicals produced by the burning of tobacco and its additives. The smoke is made up of more than 7,000 chemicals, including over 60 known to cause cancer (carcinogens). Some of these substances cause heart and lung diseases too, and all of them can be deadly. You might be surprised to know some of the chemicals found in tobacco smoke include:
Cyanide Benzene Formaldehyde Methanol (wood alcohol) Acetylene (the fuel used in welding torches) Ammonia
The carbon in the coming from the smoke get saturated in the lungs because they filters air and provides fresh air to heart to form oxygenated blood. As the capacity of the lungs get reduce you will have formation of tumors in various regions of the body in blood vessels. Most smoking causes bad breath. Anyway smoking is injurious to the health either if you smoke directly or indirectly. http://www.mainstreetdentalteam.com/tobacco-and-your-teeth/
There are many carcinogens in tobacco. These are cancer causing agents. Out of all cancers, lung cancer, due to smoking, is the leading cause of cancer related deaths for both males and females. This cancer is highly preventable, by not smoking.