the harmful effects of smoking 
Smoking can cause lung disease by damaging your airways and the small air sacs  found in your lungs. Lung diseases caused by smoking include COPD, which includes emphysema and chronic bronchitis. Cigarette smoking causes most cases of lung cancer.Nearly 23 percent of high school students use tobacco products, and more than 90 percent of those teens smoke cigarettes, cigars, hookahs or pipes, according to the report from the U.S. Centers for Disease Control and Prevention.

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