Oxygen for Performance?

I bumped into this little Youtube video / commercial today and it brought up some interesting thoughts.  I would love to hear what people think about using Oxygen in a can for performance enhancement...

Is it safe?

Is it ethical?

Should it be classified as a "Performance enhancing drug?"

Does it really help?

What about for kids?

If I knew that you could sell air in a can to help people swim faster, I might have chosen that over swim stroke analysis.  It sounds a lot easier.

PS. I think I went to an Oxygen bar once in college, they are out of business now.