Could be a very valuable thing, if only you knew how to use a such a thing. We continue to fill the interiors of a/c with stuff that gives off noxious fumes when combusted. They say that a couple of lungfulls of that stuff and you are on the floor - death follows shortly after.
I'm all for it. However, bear in mind;
i) The beancounters will never stand for it.
ii) I at least partially agree with Biscuit Chucker - a cabin fire in an airliner is a very bad day out, not liable to end happily.