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This is a group of lung diseases called COPD that makes it hard to breathe and gets worse over time. Most of the time, the airways and air sacs in your lungs are elastic or stretchy. When you breathe in, the airways bring the air to the air sacs through the nose and mouth. A small balloon of air fills the air sacs. Air leaves your body when you take a breath out. One or more of the following may be true if you have COPD.