This document discusses the negative health effects of smoking, including increased risks of developing diseases like emphysema, bronchitis, heart disease, and various cancers. It explains how smoking damages and destroys cilia cells in the lungs, impairing the body's ability to clear mucus and trap harmful particles. Long-term smokers have a 25 times higher risk of lung cancer compared to non-smokers. However, many of the health risks can be reduced by quitting smoking, as the lungs can partially repair damage over time.