In 2016, approximately 37.8 million American men and women reportedly smoked cigarettes, with more than 75 percent of them smoking every day. 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 this country. In fact, smoking is associated with cancer, heart disease and stroke, gum disease, asthma and other chronic lung conditions, Type-2 diabetes as well as serious complications of diabetes.
People with depression, anxiety, and other mental illnesses are much more likely to smoke than the general population. Often, perhaps, it's an attempt to cope with negative feelings. Smoking is not a valid treatment for any mental health condition, however, and won’t make anyone feel better in the long run. Smoking only increases the risk of developing tobacco-related diseases.