The major risk factor for chronic bronchitis is A. dust in the air. B. previous allergies. C. family history. D. cigarette smoking.

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The major risk factor for chronic bronchitis is cigarette smoking.

rdsa77|Points 8463|

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Asked 10/10/2010 9:08:31 PM

Updated 18 days ago|1/1/2019 5:53:35 AM

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This answer has been confirmed as correct and helpful.

Edited by Masamune [1/1/2019 5:53:34 AM], Confirmed by Masamune [1/1/2019 5:53:35 AM], Masamune [1/1/2019 5:53:35 AM]

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