Question

How does frequent coughing help to improve lung functioning?

Answer 1

Removes debris.

Explanation:

When you breath, air isn't the only thing you breathe. There are microscopic particles such as dust and water vapor as well. While your nasal hairs filter out some of this debris, it doesn't filter all of it. This debris then passes into your lungs. So, coughing helps remove this debris, improving the functioning of your lungs.