In world war one, what were the negative effects on the enemy for gas masks?

 Lachrymator - tear gas. This caused temporary blindness and serious irritation to the nose and throat of the victims.

Sternutator gasses - poisonous gas, chlorine, phosgene and diphosgene. Chlorine gas mixes with moisture so it will attack the eyes and lungs.

Suffocating gasses - Caused severe edema of the lungs and death from asphyxiation could come within hours.

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