COPD is the fourth leading cause of death worldwide, responsible for almost four million annually, or 5% of the total. Tobacco smoking and second- and third-hand smoking (exposure to other’s smoke or toxins on rugs, curtains, and furniture) accounts for over 70% of COPD cases in high-income countries, with symptoms including coughing, sometimes with phlegm, difficulty breathing, wheezing, and tiredness.
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