MODEL RELEASED. Healthy person using a nebuliser. A nebuliser delivers fine droplets of a drug into a face mask for inhalation. This portable nebuliser contains the drug salbutamol, which the man is testing for a study into COPD (chronic obstructive pulmonary disease). COPD is a group of diseases characterised by limited airflow lungs that is not fully reversible, such as chronic bronchitis and emphysema. Salbutamol relaxes the constricted air passages in the lungs of those with COPD.