QUESTION: Do I inhale less oxygen when using the CarboHaler?
ANSWER: Yes. Normally the air we inhale contains 78% nitrogen, 21% oxygen, 0.04% carbon dioxide, and some other gases in very small quantities.
If we set the CarboHaler to give us 4% CO2, it effectively means that we are restricting the amount of oxygen we inhale to about 20.1%. If we inhale 8% CO2, the oxygen we inhale drops to about 19.3%.