I was just talking of some personal experiences with a gas that is used in the army to train recruits in chemical warfare. They say the gas used is an off-mixture of some stuff meant to act similar to teargas, but is slightly stronger. It affects any moist part of your body, particularly your throat and eyes. Makes you puke if you inhale it.
I see what you mean though with the song itself so now I more clearly your representation of the feelings you experience with the song itself.