When I was locked up, we'd make hooch in garbage bags from pineapple tidbits and jolly ranchers, a lot of the guys would inhale the C02 every time the bags became bloated with air. I tried it once, it felt similar to the feeling you get from standing up too quickly after being low to the ground too long, or what happens when you breath in and out really hard and fast for a while....not enjoyable at all. I just chalked it up to them being so bored than any altered state of consciousness could take their mind off where they were.
You really need to get a hobby...or some real drugs.