An estimated 1 in 3 deaths from cancer are attributed to smoking, notes the U.S. Surgeon General’s 2010 report on the relationship between smoking and disease. The report points out that smoking causes 87 percent of lung cancer deaths and is also responsible for cancer in many other parts of the body. If you smoke, you are at higher risk for cancers of the esophagus, throat, mouth, and stomach, among others. In addition to the addictive ingredient of nicotine, cigarettes contain about 600 ingredients. When burned, 4,000 chemicals are created, approximately 50 of which are carcinogenic.