<unk>  has a different range of risk factors that can be differentiated based on the age. In adults, common risk factors in the development of<unk>  include exposure to cigarette smoke, living in crowded areas, and being immunocompromised. In infants, the risk factors include age < 6 months, lack of breastfeeding, prematurity and having a history of or suffering from congenital heart diseases.
Bronchiolitis risk factors
Bronchitis risk factors
Bronchiectasis risk factors
Chronic bronchitis risk factors
Pneumoconiosis risk factors
Pneumonia risk factors
Acute bronchitis risk factors
Tracheitis risk factors