Why is lung disease a major cause of aging?

The reason why lung disease is one of the top six causes of aging, according to our government, is that we are continually renewing the very thin and sensitive cells in the lungs so that we can exchange oxygen and carbon dioxide. As the stem cells that regenerate these cells start to slow down, the renewal process lags, and the lungs scar (a process called fibrosis) and become resistant to air exchange. The process of breathing is kind of like taking sandpaper to your lungs.

But with fibrosis, the lungs are rough like cement. You can get the smoother, varnish-like lining you want by eliminating some of the risk factors, like smoking, high blood pressure, and diabetes.

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