A portable gas delivery system is provided to provide oxygen or other
gaseous mixture for use in emergencies, athletic events, and similar
activities. The portable gas delivery system includes a regulator with an
accumulator chamber disposed within the regulator and adjacent a mixing
chamber. The accumulator chamber receives oxygen or other gas from a
replaceable gas source such as a cylinder. The mixing chamber mixes
ambient air and gas from the cylinder to form a gaseous mixture which is
inhaled by a user. Each use of the portable gas delivery system may be in
metered burst of predetermined duration and/or frequency or may be
substantially continuous as provided for in the accompanying method.