Gotta butt in here. The semantic difference is looking at it from a chemical perspective the only difference between oil and fat is the fatty acid molecule length, and oils can be said to be a subset of fats, i.e. fats with a melting point less than room temperature are liquids, usually known as oils.
I got a degree in chemistry so that I could be a web designer and musician... ;-)
Gargoyle, I hope you're kidding about huffing that stuff. I have a better idea than most of exactly what's in there, and it ain't pretty.
Huffing Carbon Dioxide won't do anything but make you hyperventilate (maybe in extreme cases, pass out.)
Carbon monoxide will kill ya dead dead dead.
OK, that's my over-educated inflated chemistry rant for today.