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I don't know all the scientific respiratory issues with smoking, but I remember my O2 oxygen being in the mid to higher 90's when I smoked and it was checked for whatever reasons.Today I went to see my Dr. and they took all my vitals and I was pleasantly surprised to see my O2 oxygen saturation level at 100%.
Maybe it can fluctuate, I don't know, I just know I haven't seen that number that I can remember EVER.
O2 saturation
