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"Except for helium, no other gas exists which does not have some form narcotic effect at higher pressures."

I assume the narcotic effect of fluorine, chlorine and bromine are basically unstudied...

You may have confused narcotic with necrotic.

I could hear the dice rolling in my head

i got a lungful of chlorine gas once and it wasn't narcotic in the slightest. I wheezed and coughed for about 20 minutes.

If you get more of it you definitely won't wake up.