Chronic Obstructive Pulmonary Disease (COPD) is a disease of the lung with around 80% of cases directly attributable to smoking.
COPD describes a group of lung conditions that make it difficult to empty air out of the lungs because the airways have become narrowed.
British Lung Foundation. Chronic Obstructive Pulmonary Disease. https://www.blf.org.uk/support-for-you/copd/what-is-copd