This document discusses the harmful effects of cigarette smoking on various parts of the body. It notes that smoking during pregnancy increases risks of spontaneous abortion and stillbirth. Smoking also worsens other diseases like asthma, influenza, tuberculosis and ulcers. It doubles risks of impotence in men and dries out the skin. Smoking damages teeth and increases risks of mouth infections and oral cancer. Long-term, it causes serious diseases like lung cancer, heart disease and emphysema. The document also discusses environmental tobacco smoke, or second-hand smoke, which contains over 250 toxic substances including 50 that cause cancer. It describes the differences between mainstream smoke exhaled by smokers and side-stream smoke that wafts from the burning