The way I read it at least, it was in a place where a non-smoking policy was in effect, and probably the author had previously asked someone not to smoke, and gotten the response "oh, you can't really be allergic to it."
Then you didn't read the same post that I did. Nowhere did he say that this was in a non-smoking area, and nor did he say that he had politely asked them to stop (although I'll accept that he might have; however, if smoking is permitted in that place then if he doesn't like smoke he should go elsewhere, not stop everyone else from smoking perfectly properly). What he said he'd done was to take someone's property and destroy it (which I think you'll admit is quite rude), and had then used the broken ciggie to deliberately hurt himself.
If I were to take your property, destroy it, and then hurt myself on the bits, would you apologise? No, you'd be angry at me for destroying your property, and you'd laugh at me for being so bloody stupid. What Arden did was very rude and very stupid. He even admits he was being stupid!