I once had the misfortune to inhale deeply after an eruption by Old Faithful, the Geyser in Yellowstone Park. I got a lungful of something very like Hydrogen Sulphide. It did not “paralyze my nasal passages” or prevent my sense of smell. It did make me regurgitate the contents of my stomach. I boked my guts up, or, if you prefer, I “tossed my cookies”. I do not recommend it.
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