It's absolutely true: pure oxygen can give rise to feelings of euphoria. Not for the people who inhale it from oxygen vending machines - which, as reported this week, are now being tested in nightclubs - but for the people who sell it.

What happens when you inhale pure oxygen?

Breathing pure oxygen sets off a series of runaway chemical reactions. That's when some of that oxygen turns into its dangerous, unstable cousin called a “radical”. Oxygen radicals harm the fats, protein and DNA in your body.

Does oxygen masks make you high?

So wear the mask. And what about Tyler Durden's claim that oxygen makes you high? It doesn't. Pilots and astronauts will readily debunk that myth.