As far as I'm aware the stuff used recreationally is impure enough that it's not really useful for much else so it's not terribly important to curb it's use lik

As far as I'm aware the stuff used recreationally is impure enough that it's not really useful for much else so it's not terribly important to curb it's use like it might seem at first. The stuff used for Scientific, Medical, or even Industrial uses needs to be much more pure from other gasses and contaminants to work properly.