If I may interject...
To me, there are different 'kinds' of hot, and they have differing qualities. Wasabi being a good example.
While peppers can bring my mouth to a boil and make my eyes water, wasabi does that quite well to. It also lights up my nose as well while peppers don't seem to. Sure, my nose will run under peppers, but the lack of burn just isn't there like it is with wasabi.