What were the problems using poison gas in World War 1?

The use of poison gas in World War I posed several significant problems. Firstly, it was unpredictable; wind changes could expose soldiers on both sides to the toxic fumes, leading to unintended casualties. Additionally, the effects of gas could be agonizing and prolonged, causing severe injuries and psychological trauma. Finally, the development of countermeasures, such as gas masks, diminished its effectiveness and led to a brutal arms race in chemical warfare.