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Do you know what it is? In New Zealand, inhalation chambers were installed in public buildings in 1918 and people were asked to inhale a gas (zinc sulphate) that would protect them from the flu. Conclusion: people got very sick and many died. To use public trains, you needed proof that you had been in an inhalation chamber. Sound familiar? https://nzhistory.govt.nz/media/sound/influenza-inhalation-chamber