The document discusses the health risks of smoking and second-hand smoke. It notes that smoking kills over 490,000 people per year worldwide, more than AIDS, tuberculosis, and malaria combined. Smoking causes numerous cancers as well as cardiovascular and respiratory diseases. Second-hand smoke can cause health issues like lung cancer and asthma in non-smokers. The document encourages protecting non-smokers from the ill effects of smoking and notes that quitting can be difficult due to both physical and psychological dependency on nicotine.