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Effects of tobacco smoking The A Level Biologist Your Hub While occasional brown phlegm can be harmless, it should not be ignored, especially if it keeps coming back or is getting worse. Coughing up spotty phlegm : r trees tobacco phlegm Brown stuff in Mucus : r stopsmoking Tobacco Smoke Induced Cough: Mechanisms Driving Acute and Chronic Cough Pathology IntechOpen
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