Research from the United States shows that although only ___ percent of smokers develop COPD, _____ percent of all COPD cases are the result of smoking.

Name: Research from the United States shows that although only ___ percent of smokers develop COPD, _____ percent of all COPD cases are the result of smoking.
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The Answer of Research from the United States shows that although only ___ percent of smokers develop COPD, _____ percent of all COPD cases are the result of smoking.

Research from the United States Shows That Although Only ___