Is it always good to breathe pure oxygen?

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None of us can live without breathing oxygen. But too much oxygen can actually harm the body. You might have seen doctors giving oxygen in certain emergencies such as severe lung disease. However, that is nearly five times the normal concentration of oxygen in the air. If one continuously breath 100% oxygen for a prolonged time, it would cause accumulation of fluid in the lungs, collapse of air sacs etc.  Much lower oxygen concentrations are used for proponged treatment in hospitals.

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