But why?: That's like saying, "I don't have high blood pressure, but can I take blood pressure drugs anyway?" We breathe air at sea level that has "1 atmosphere" of pressure, if we are at the beach. A flying airliner's air has LESS pressure than at the beach, because the plane's cabin air pressure is set at 6000-7000 feet high in the plane. So, being in the plane is like being at a ski resort at 6500 feet.
Answered 12/17/2015
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