Nitrox refers to any gas mixture composed (excluding trace gases) of nitrogen and oxygen; this includes normal air which's approximately 78% nitrogen, 21% oxygen, and 1% other gases, primarily argon. However, in SCUBA diving, nitrox's normally differentiated and handled differently from air. Nonetheless, there remains a body of the diving community that insists that they feel reduced narcotic effects at depths breathing nitrox. This may be due to a dissociation of the subjective and behavioural… (More on Nitrox)