It's a gas.

[vakkotaur]

Sure, I've seen the foods list. It had a few drinks in it as well. But that's just two phases of matter, solid and liquid. This will help to complete the set. This is not a list of things you should try. There are some gases that are very much not recommended.



I might be wrong about a couple things, but what I can recall, I've marked.

Bold gases you've breathed.
Italicize gases you've only caught a whiff of (even if odorless).

Hydrogen
Helium
Neon
Argon*
Krypton
Xenon
Radon
Fluorine
Chlorine
Bromine vapor
Nitrogen*
Oxygen*
Carbon Monoxide
Carbon Dioxide*
Water Vapor*
Nitric Oxide
Nitrogen Dioxide
Chloroform
Cyclopropane
Diethyl Ether
Ethyl or Methyl Mercaptan
Halothane/Fluothane
Isoflurane
Nitrous Oxide
Ozone
Acetone vapor
Acetylene
Ammonia
Methanol
Ethanol
Butanol
Sulfur Dioxide
Hydrogen Sulfide
1,1,1-trichloroethane
2-Chlorobenzalmalononitrile (CS tear gas)**
Carbon Tetrachloride vapor
Arsine
Chlorine Trifluoride
Hydrogen Cyanide
Phosgene
Silane
Selenium Hexafluoride
Sulfur hexafluoride
Uranium Hexafluoride

* Atmospheric
** Actually delivered as an aerosol and not as a true gas.

Comments

[nefaria.livejournal.com]

Hydrogen cyanide is groovy, man! I heard phosgene is a trip too, tastes great on hot dogs. And I always wanted to huff some uranium hexafluoride, but dude, that stuff's expensive.

[haystack.livejournal.com]

If you've ever disturbed a millipede, you may have gotten a whiff of hydrogen cyanide.

I've nearly passed out from overexposure to the fumes of odorless mineral spirits -- they might be odorless and have the most toxic components removed, but they are still toxic enough to knock someone out with prolonged exposure. Other artistic annoyances include methanol and acetone (we use them in printmaking), as well as xylene from the enormous Sharpie Magnums we use to tint our wood/lino blocks prior to cutting.