"Back in the days when I was indulging in ethyl alcohol imbued consumables (in other words, back when I was a drunk) I used to huff O2 from my Dad's Oxy-Acetylene setup."
Guess I'm the duty doom-sayer on this thread.
You should never, never, never inhale any gasses from any source not cleared for human consumption. Even tiny amounts of contaminants can kill you.
I am pretty sure welding O2 and medical O2 are dispensed from the same bulk tanks...