> a couple of breaths of pure oxygen will relieve pain and induce euphoria. Nah. I've breathed pure oxygen under water for 10 minutes at a time at a ppO2 of 1

> a couple of breaths of pure oxygen will relieve pain and induce euphoria. Nah. I've breathed pure oxygen under water for 10 minutes at a time at a ppO2 of 1.6 and it doesn't really do much.