This document discusses the harmful effects of tobacco use and provides information on how to stop using tobacco or help someone quit. It notes that tobacco smoke contains over 400 chemicals and 63 that cause cancer. Smoking increases the risk of various cancers and diseases. Secondhand smoke can cause over 50 types of cancer and heart and lung disease. Ways to stop tobacco use include educating people on the deadly effects and benefits of not using. Doctors and friends can also influence decisions to quit or not start. Secondhand smoke kills thousands from cancer and heart disease each year.