Hmm.... my definition of "toxic" isn't technical, but I don't classify capsaicin as "toxic" at all. My definition has to do with the physiological reaction of the average living thing (being human, animal, plant....) If I limit it to people, most don't have what I consider a "true" pain reaction to capsaicin - sure, it feels like it's burning, but it doesn't actually burn (unlike getting, say, battery acid on your skin.) I guess I'd have to describe it as similar to (but not same as) the "phantom pain" felt by amputees - the sensation is there, but it's pretty much purely a sensation. This is in the absence of other factors, such as allergies, which is why I say average.