"The most common cause of COPD is cigarette smoking; about 20 percent of smokers develop lung disease. Other causes of COPD are:
breathing in dust and chemicals (vapors, irritants, and fumes), and coal dust or silica at work
indoor air pollution from cooking fuels and heating in poorly ventilated homes
childhood lung infections that can lead to problems in adulthood
Thought ill let all the smoker know that.
Quite scary (copd-causes) "
And actually passed?