The document discusses the negative health effects of smoking cigarettes. It notes that cigarettes contain over 4,000 ingredients including arsenic, acetone, ammonia, cadmium, formaldehyde, and carbon monoxide. Smoking increases the risks of various cancers, heart disease, teeth discoloration, and respiratory illnesses. It also outlines the financial costs of smoking and some of the health benefits within 72 hours to 15 years of quitting such as improved lung function and reduced cancer and heart disease risks.