Throughout the normal mammalian lungs, there are two main parts of the lungs; bronchioles and alveoli. Bronchioles are very narrow and tiny in sizes within 0.5 to 1 mm diameter. They are responsible for uptaking the air from the bronchi to the alveoli and regulating of how much air exposed to the lungs. Alveoli is a tiny ball sac and its job is to exchange O2 and CO2. And how the cigarette smoke influences their function is that the production of mucus would increase rapidly causing the bronchioles to thicken, which makes it difficult to breathe and brings damages to the alveolar walls. Not just the issue of the bronchioles and alveoli, it can also lead to the result of airway and lung disease. As a matter of fact, airway disease occurs
