nitrous is very different to hyperventilation.. but when you do nirous (usually out of baloons) you also hyperventilate to get a stronger longer lasting effect..
Really now? The only thing I can think is that you must have sucked some out of a whipped cream can or something. Real nitrous is not like hyperventilating.
you're joking, right? nitrous is *not* a placebo nor simply a way to decrease oxygen as a way to get high on asphyxiation. In fact nitrous is much more effective if you take deep breaths of oxygen right before hitting the nitrous.