does chewing tobacco cause phlegm The Association Between Smokeless and a Lung Mass in a Healthy Young Male Oral Changes Associated with Tobacco
Description
Abstract An estimated 65 million people worldwide have moderate or severe chronic obstructive pulmonary disease (COPD), an umbrella term used to describe a group of progressive lung diseases that obstruct airflow such as emphysema and chronic bronchitis

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Emphysema and chronic bronchitis often occur together, so the general term COPD may be used

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