_____ accounts for 80 percent of all cases of chronic obstructive pulmonary disease (COPD).

Question

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Smoking is the leading cause of COPD. Around 80 percent of all COPD cases are due to smoking or exposure to secondhand smoke. Other risk factors include environmental factors, genetics, and occupational exposure to pollutants such as dust, chemicals, and fumes. Hypertension, obesity, and alcoholism may contribute to the development of COPD, but they are not the main cause.

_____ Accounts for 80 Percent of All Cases of Chronic