Cigarette smoking is responsible for more than 480,000 deaths in the United States each year, including 41,000 from second-hand smoke. That makes tobacco the single largest preventable cause of death and disease in the U.S. Worldwide, about 7 million deaths each year are due to tobacco use.
Smoking is associated with cancer, heart disease and stroke, gum disease, asthma, and other chronic lung conditions, and Type-2 diabetes as well as serious complications of diabetes. About 14 percent of U.S. adults smoked cigarettes in 2017, according to the CDC, and it was recently estimated that nearly 7 in 10 wanted to stop smoking.
People with depression, anxiety, and other forms of mental illness are much more likely to smoke than the general population. While smoking may be used, in part, as a coping behavior, it is not a valid treatment for any mental health condition.