I'm going to take abandoned gas
What are you planning on doing with the stolen gas?
I heard that you can get high by the effects of the gas
It is quite dangerous to huff gas fumes and can do lasting damage on your brain. Additionally, just because the gas seems abandoned doesn't mean it is and it's always wrong to steal.
It's cool. As long as no one is using it why should people bother?
You should really think about this a bit more. The legal ramifications could put you in jail, but the medical effects are even worse. You could kill yourself, and if that's something that you are okay with, you need to talk to a doctor.