And the fact is that kids who have been doing it, have been for a very long time. Glue-sniffing has been around longer than I have, and it amounts to the same thing: inhaling something that intereferes with respiration and/or oxygen absorption. Ban canned "air", and they'll find something else to use. Ban everything, and they'll hold their breath until they get dizzy (which is basically what they're doing already). It's not going away...
...and frankly, I'm not sure I'd want it to. If you're too stupid to know the difference between a high and oxygen deprivation, you are literally too stupid to breathe.