2
7 VISIT
12 1.
2. Chronic bronchitis is a serious lung infection which is often caused by smoking 3. Many smokers have a cough which is caused by the chemicals in smoke 4.
5.
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2
12 1.
2. Chronic bronchitis is a serious lung infection which is often caused by smoking 3. Many smokers have a cough which is caused by the chemicals in smoke 4.
5.
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