The major risk factor for chronic bronchitis is
A. family history.
B. dust in the air.
C. cigarette smoking.
D. previous allergies.
The major risk factor for chronic bronchitis is cigarette smoking.
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Asked 9/19/2010 3:05:47 PM
Updated 4/12/2015 11:59:51 PM
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yumdrea [4/12/2015 11:59:50 PM], Confirmed by
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