The best way to explain how our lungs work is to think of them as an upside down tree. A long trunk, called the trachea, leads to thick branches. Off those branches, called bronchi, shoot smaller limbs, known as bronchioles. At the ends are the leaves called alveoli.

In order to keep your lungs healthy, there are a variety of things that you should and should not do. As is usual when talking about such things, smoking is inevitably the first thing that springs to everybody’s mind, but avoiding cigarette smoke is not the be all and end all of keeping a healthy pair of lungs although giving up the evil weed can be a big help. Many other lifestyle choices can have an influence on lung health, as well.