It is very important.
Tobacco use remains the single most preventable cause of death in the United States.
Cigarette smoking accounts for nearly one-third of all cancer deaths in this country each year. Smoking is the most common risk factor for the development of lung cancer, which is the leading cause of cancer death. It is also associated with many other types of cancer, including cancers of the esophagus , larynx , kidney, pancreas , and cervix . Smoking also increases the risk of other health problems, such as chronic lung disease and heart disease. Smoking during pregnancy can have adverse effects on the unborn child, such as premature delivery and low birth weight.