Does Foul Vapors affect units /w 100% poison res?

[Endoperez]

5 AN poison damage to 10% of units, every turn. It will cause lots of norale checks, at least. it can kill 10-hp units and weaken anything. It can deal damage to things otherwise hard to damage, like Vanir and mages. However, I don't think there's any totally poison-immune race, so everybody needs to use it with Poison Ward or something.