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yeah, the g dead, 5'tanks in front of each row of cars at the parking lot scene. Those were the days my friend. Hippy crack is an accurate description. It used to go for about $5 for a big balloon (~1.5' diameter). With acid n2o is even more awesome!!!! (as if that were possible, and yes it is)
Just remember, never and I mean NEVER suck direct from a tank. It will freeze your lips and lungs like liquid nitrogen. Use a balloon. It will make it safer. Just like No. 10986 says, the tank gets cold as the gas is released from the tank. Ive seen 1" of ice form on a tank being used outdoor in 80 degree f weather. Compressed gas physics.
Also it is a good idea to sit down or lay back. NNO is used as a medical anesthetic, it will make you pass out at some point, and you don't want to fall on a glass coffee table, or your friends stereo or break anything. (in medical use they mix it with oxygen and have someone to monitor that you are breathing, if that says anything about its power)
A balloon is safer than any non retracting plastic bag because when you use it up or pass out while sucking it in the balloon will contract or fly away. If you use a plastic bag you run the risk of passing out and the bag asphyxiating you. In your unconscious state you will not be pulling the bag out of your airway. And you cant always rely on friends to be aware of your condition, so play it safe. Oxygen is good.
Years ago I saw inside an old Mother Earth catalog someone had published a book on the safe use of N-2-O. It was kinda like those old old books on how to grow shrooms or pot in that it had comic style illustrations mixed in with accurate illustrations. I would love to find that just to look at it. To have a copy would be priceless.
After a binge night of working on a 5' tank with about 7-10 friends we still had not drained it. However it made my brain feel slow foggy and stupid, I couldn't study for school for about 2 days. Moderation is better, I think long term use can f' up your liver or something & some other problems occur.
Love & peace