Couldn't you get arrested even if it wasn't real gas? Er, like, deadly stuff.
If you intended to scare people doing it you can be charged with making terroristic threats.
this is not terrorism jfc
Yes it is you stupid stuff.
A few months ago some random guy called in a false honor student at my old high school. He went down for 3 counts of making terroristic threats. If you do something to make people fear for their lives, even if it is fake, it can still be considered terrorism threats.