COPD is any obstruction in the air way , it isnt always cigarette caused, children with chronic asthma have a form of COPD.
If a person had asthma as a child their chances of developing it are 100 times more likely.
People who work in certain mills and factory will contract COPD.
Hay, dust,allergies etc will cause COPD.
While they love to claim smoking is the number 1 cause, thats not always the case.
My Late Aunt was diagnosed with COPD and she never smoked a day in her life, was never around anyone who smoked, BUT she worked in a factory that made furniture.seems the dust from sanded wood was the culprit.
I am by no means advocating smoking, I wish I could quit. all I am saying is there are other causes for this disease.