Why was poison gas a potential hazard for the troops that used it?

Poison gas was a potential hazard for troops that used it because of its unpredictable nature and the difficulty in controlling its dispersion. Wind conditions could change rapidly, causing the gas to drift back towards the attacking forces, leading to unintended casualties among their own ranks. Additionally, many types of gas caused severe health issues, which could incapacitate soldiers and complicate medical treatment. The lack of effective protection and the psychological impact of using such weapons further heightened the risks involved.