Poison gas was used in both ww1 and ww2.in ww1 poison gas was used in trench war fare mostly tear gas so most people carried gas masks where ever they go.In ww2 poison gas was used during the holucast and killed millions.Soldiers avoided gas by using gas mask.There wasn’t a specific treatment but they can prevent it by waearing a gas mask.If you get in contact with gas it usually involves in death but other gasses just make you blind and lost of hearing
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