Although only ___ percent of smokers in the United States develop COPD,_____ percent of all COPD cases are the result of smoking.

Name: Although only ___ percent of smokers in the United States develop COPD,_____ percent of all COPD cases are the result of smoking.
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Although only 20 percent of smokers in the United States develop COPD, a staggering 80 to 90 percent of all COPD cases are the result of smoking. This underscores just how damaging smoking can be to a person's lungs and overall health.

Although Only ___ Percent of Smokers in the United States