The major risk factor for chronic bronchitis is
A. cigarette smoking.
B. previous allergies.
C. dust in the air.
D. family history.
The major risk factor for chronic bronchitis is cigarette smoking.
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Asked 11/25/2010 2:02:00 PM
Updated 11/27/2018 5:38:45 AM
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Edited by
Masamune [11/27/2018 5:38:41 AM], Confirmed by
Masamune [11/27/2018 5:38:44 AM]
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