Try this 4 - question quiz to see how much you know about COPD: Causes .

1. The main cause of COPD is

That's correct. A is the correct answer.

The main cause of COPD is cigarette smoking. Pipe, cigar, and other types of tobacco smoking can also cause COPD, especially if the smoke is inhaled. Breathing in other fumes and dusts over a long period of time may also cause COPD. Secondhand smoke may also play a role in causing COPD.