You know, in the case of asthmatics especially, that could happen, as the extreme burn interferes with breathing. Looks like this plonker was on his own too, so there wouldn't have been a video if it had killed him or put him in hospital.
Such a stupid thing to do, I couldn't believe it when he popped the whole thing into his mouth at once. I think it was cut in half though. Did you notice that he had gloves on his hands? That's how potent it is.