Only time I ever have used N2O was at the dentist, and a few times while I was working at Starbucks. Starbucks uses the big metal reusable whipped cream canisters that you fill with vanilla syrup and heavy whipping cream, screw an N20 charger into it and that aerates it and makes it all fluffy. I would just take a box of 10 chargers and go in the freezer, put them in the canisters by themselves, turn them upside down, squeeze and inhale. Though, I highly recommend not doing that. You can do some serious damage to your lungs that way, and it only fucks you up for about 5-10 minutes so it's kind of worse than crack (aside from taking cocaine, changing it chemically, and then, not only smoke, but actually incinerate (as opposed to vaporizing it like meth) the harsh chemicals, thus changing the chemical make-up again, to inhale) in my book, now that I look back on it.