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The major risk factor for chronic bronchitis is a. previous allergies. b. cigarette smoking. c. dust in the air. d. family history.

The major risk factor for chronic bronchitis is a. previous allergies. b. cigarette smoking. c. dust in the air. d. family history.
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the major risk factor for chronic bronchitis is a. previous allergies. b. cigarette smoking. c. dust in the air. d. family history.

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User Muhammad Naufil
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5 votes

The answer is A, have a nice day.

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User Melchiar
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7.9k points
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The major risk factor for chronic bronchitis is a/
b. cigarette

answered
User Ramkee
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6.9k points
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