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This means each year smoking causes about 1 out of 5 deaths in the US.
Normally, tiny hair-like structures (called cilia) in the airways help sweep harmful material out of the lungs. Preventing Tobacco Use Among Youth and Young Adults: A Report of the Surgeon General.
COPD, or chronic obstructive pulmonary disease, is the name for long-term lung disease which includes both chronic bronchitis and emphysema (discussed below).