Causes of COPD
COPD usually develops because of long-term damage to your lungs from breathing in a harmful substance, usually cigarette smoke, as well as smoke from other sources and air pollution.
Jobs where people are exposed to dust, fumes and chemicals can also contribute to developing COPD.
You’re most likely to develop COPD if you’re over 35 and are, or have been, a smoker.
Some people are more affected than others by breathing in noxious materials. COPD does seem to run in families, so if your parents had chest problems then your own risk is higher. A rare genetic condition called alpha-1-antitrypsin deficiency makes people very susceptible to develop COPD at a young age.