Cigarette smoking is the most important preventable cause of disease and death in the United States, with over 3,000 children starting to smoke daily and 20% of American teens smoking regularly. Smoking during pregnancy increases risks of complications like low birth weight, miscarriages, and birth defects. Secondhand smoke exposure also causes disease in non-smokers, with over 3,000 non-smoking adults dying annually from secondhand smoke and most children being exposed to smoke in their households.