The amount of time has no relevance to how easy the death is.
You could set the mouse on fire, and I'm sure it will die in about 30 seconds. You could drop it into boiling water and I'm sure it will be quicker. That doesn't mean it's humane.
Gas injested DOES get into the body. That's why smoking is a way to injest drugs, and so is insuflating.
Please do more research, we're all suggesting it.
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