The most important cause of chronic obstructive pulmonary disease (COPD)in the world is ________.

Question

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Worldwide,tobacco smoking is the most important cause of COPD.Approximately 12.5% of current smokers and 9% of former smokers have COPD.Smoking also accounts for 85% to 90% of COPD-related deaths in both men and women.The risk for development of COPD is dose related and increases with the number of cigarettes smoked per day and duration of smoking.

The Most Important Cause of Chronic Obstructive Pulmonary Disease (COPD)in