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You breathe in and out anywhere from 15 to 25 times per minute, Without even thinking about it. When you exercise, your breathing rate goes up -- again, without you thinking about it. You breathe so regularly that it is easy to take your lungs for granted. You can't even stop yourself from breathing if you try! Smoker's Lung Pathology Photo Essay This photo … [Read more...] about How Your Lungs Work