Let me clarify what I posted earlier.
People who use it with chickens use it in the chicken bedding and as an additive in dust beds that the chickens scratch/roll in. If it was dangerous to inhale it would be dangerous to the chickens since they are aerosolizing it by scratching/rolling, but they suffer no ill effects. Considering that snakes are not going to be aggressively rolling in it I doubt that they would be able to aerosolize it at all so the odds of them inhaling quantities larger than what chickens breath in are slim, plus the added humidity levels of our tubs are going to keep aerosolization down as well.
I do not see any reason to suspect it would be harmful
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