Been around for a while, it seems:
Ancient Persians were the first to use chemical warfare against their enemies, a study has suggested.
A UK researcher said he found evidence that the Persian Empire used poisonous gases on the Roman city of Dura, Eastern Syria, in the 3rd Century AD…
The study shows that the Persians dug a mine underneath the wall in order to enter the city.
They also ignited bitumen and sulphur crystals to produce dense poisonous gases, suggested Simon James, an archaeologist at the University of Leicester.



nahhhh. Probably found coprolite remains and the effects of poor diets in an enclosed space. We had similar attacks on the ship when rations were a bit dicey………. is that known as friendly fire?
Shades of the siege of Petersburg…Burnside must not have gotten the “noxious fumes” memo…
Noxious effluvia emanating from the Goat Locker, eh? Oh the humanity!
Obviously they were planted there by Cheney McHitlerBurton!
[...] to WMDs, Lex found the Persians were the first users of chemical weapons. Why do I get the sinking feeling [...]
According to news reports, Al Qaeda in Algeria was doing Biological warfare experiments with Black Plague. They were apparently forced to close a camp when 40 of their troops died from it.
Really nice thing to see now that we have a group in office that officially denies reality, eh?