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COPD is considered to be the leading cause for lung problems in must smokers. Your lungs work, breath in and out, a little at a time. A normally person retains oxygen of between 95% to 100% depending on what they are doing at the time. This is the oxygen that is retained in your lungs. A smoker on COPD bottom number is 88%, maybe a top of 93%, that is if they have tubes in their nose feeding them oxygen.
I hope you don't go through that, man I hope you don't, but the facts are there for anyone to see, and they are pretty stacked against you!
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