Navouh

The navouh, a plant with pretty blue flowers, helps fight against Inhalation poisons. But its infusion clogs the respiratory tract, which immediately tires you when you want to run, for example. An overdose of navouh can even cause death by asphyxiation.
Drinking a navouh infusion gives a +2 bonus to saving throws against all Inhalation poisons for the next hour. The subject does not, however, recover any hit points lost due to the poison.