WWI was the first occasion where poison gas was used as a weapon. Explain and elaborate.

These gas masks protected animals and people in WWI.
This is a poison gas canister.

There are several types of gases.The Germans invented the poison gas in April of 1915.Blister Gases irritate skin and eyes. Choking gases attack the respiratory tract and produce irritation and choking. Nerve gases enter the body threw the skin, destroying function of nerves. Pshycochemical Gases attack brain and induce hallucinations. Tear gases produce severe irritation, blinding the person in tears.

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