Yep, I've done that Ed in my early days of experimentation. Cleared out our house, nearly killed the cat and dog, and wiped out all the wildlife for two hundred yards. :

A friend told me that this was a form of phosgene or mustard gas that had be tried in warfare; not sure about that, but seriously it nearly put me in A&E. Beware fellow travellers, always keep the windows open and NEVER put a lid on the pan when cooking lots of chillis!
CP