What causes COPD ?
Cigarette smoking is the most common cause of COPD. Most people with COPD are smokers or have been smokers in the past. Breathing in other fumes and dusts over long periods of time can also lead to COPD. Pipe, cigar, and other types of tobacco smoking can cause COPD, especially if the smoke is inhaled. Exposure to secondhand smoke can play a role in causing COPD. Most people with COPD are at least 40 years old or around middle age when symptoms start.