I have never had the dubious honor of having been gassed with CS, just how bad is it, compared, to say chloroacetone, acrolein, capsaicin, bromobenzyl cyanide etc?
I found chloroacetone worst on the nasal passages, very intense, like having a hornet sting and then a red hot bit of metal up the nose.
Acrolein was more of a tearjerker though, not as much pain, but a great deal more lacrimation.
Capsaicin...need i say more
BBC was just nasty, only been exposed to it once, and don't plan on a second treat of that nature, as bad or worse than chloroacetone.
I plan on testing the cyanogen halides, and the xylyl halides sometime, although I gather the iodide is hard to synthesize.