What happens during coughing is we lose too much CO2 and carbon dioxide is very important for healing of our airways, for the normal work of our urge-to-cough receptors: because when we hyperventilate, and this is exactly the case, according to many medical studies, for people with COPD, asthma, bronchitis, cystic fibrosis and other conditions, these people have reduced amounts of CO2 in their airways and that causes irritation of their urge-to-cough receptors. And therefore, they have chronic problems with coughing. Apart from that, heavy breathing (or hyperventilation) reduces oxygen level in body cells. And that causes suppression of the immune system: because when we develop cell hypoxia or tissue hypoxia, we start to generate free radicals in body cells, due to anaerobic respiration of our cells. So, oxygen is very fundamental for our health. And hyperventilation causes exactly the opposite effect. Therefore, people with chronic coughing are going to benefit from very simple breathing exercises, which are going to be explained next. The very first step is to learn how to cough only through your nose. So, you keep your mouth closed and start coughing only through the nose. The next step is to learn how to cough with your mouth and with your nose closed. That means you close your nose and try coughing this way. This way, you are going to have about normal concentrations of CO2 in your airways, and that’s going to calm down your urge-to-cough receptors. In addition, there is a third exercise, which is called the “reduced breathing exercise”. And this reduced breathing exercise will teach you how to breathe a little bit less air, so that you have more carbon dioxide, more CO2, which improves oxygen transport. And eventually, when you achieve about thirty seconds for the body oxygen test, you are going to eliminate inflammation, in a significant degree, and your bouts of coughing will disappear completely.