Okay, for more than the average person would ever want to know about Nitrous Oxide...
With nitrous oxide the main danger is when you take it by strapping a mask to your face which is hooked up to a tank, or if you do it by filling a glad bag with the stuff, then putting it over your head. ( for an example see David Lynch's film "Blue Velvet"; guess what's in Dennis Hopper's little tank ) Too much and you pass out, and you won't be able to take the mask or bag off. An obvious danger, but many of those in the drug culture are not noted for their brains.
Also, directly inhaling from a tank is a big no-no. Beacause of some physical law, gas rushing through a small opening has a really low temperature, so anything touching the nozzle will quickly be temporarily frozen to it, like a balloon, or one's fingers, or teeth and lips! Over inflation of the lungs with subzero gas sounds like a major "ouch".
"Back in the Day", my friends and I would occasionally purchase the little whipit canisters mentioned above from a local porn shop, along with several "punching" balloons (like your kids get from the vending machines) and a little plastic do-hickey called a "cracker", which is used to pop the canister's seal and fill the balloon. No "apparent" danger with this method. Pretty hard to pass out since the ballons are so small, unless you have several filled ballons. But if you're (un)lucky enough to have a tank...you can make the balloons as big as you want. Just make sure you have a safe place to land when you pass out. It IS an amazing high. You continue to run at the same speed, but reality seems to run progressively slower. Strange audio effects. Giddiness. Strange philosohpic realizations that you can't quite remember when you come out of it. We would sometimes purchase 4 or 6 whip cream cans at the local stop 'n' rob, for a quick fix. But using the the cans, then putting them back on the shelf??? How amoral. Kids these days...
This stuff is very popular at raves, where guys sell it out of the back of vans by the balloon. I believe Nitrous oxide is used in racing to give a car a "turbo boost", so drug-ees can get the tanks filled there. But many places put a disgusting sulfur compound in it to discourage improper use. Ripping off the tanks at night from medical clinics is a popular method.
I'm not aware of any serious side effects, aside from vitamin B defficiency from habitual use. Doesn't appear to be physically addicting. Psychologically so, maybe. I may be wrong, do not quote me on this. Does it kill brain cells? Then why would the dentist give you enough to make you pass out? Seems like a good way to get royally sued if it did. Then again, x-rays aren't that great for you either.
Who knows, but it certainly isn't a healthy scene. I've been out of the drug culture for 3 years now, thank God. I no longer associate with those who choose to (heavilly) anesthetise themselves from reality. I'm in college, and I need my brain running at full capacity.
For those parents with teenagers out there, there's a sinister reason behind the puching balloons in Jimmy's sock drawer.
[This message has been edited by Mr. Pink (edited April 25, 2000).]