The slope means two things. One is you can run out of lung at an early age - prematurely. You don't want your lung to be the deciding factor of how long you live. Second, when smoking, air pollution and other assaults eat away at the lung's ability to provide enough oxygen, the rest of the body can become weakened, he said. If the lung won't supply the heart with oxygen, he said, the same problem can result.
Carbon monoxide can be gauged and eliminated indoors, researchers say.
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