The acoup blog has an amazingly detailed post on chemical weapons and the reasons behind their disuse today: https://acoup.blog/2020/03/20/collections-why-dont

The acoup blog has an amazingly detailed post on chemical weapons and the reasons behind their disuse today: https://acoup.blog/2020/03/20/collections-why-dont-we-use-chemical-weapons-anymore/ https://acoup.blog/2020/03/20/collections-why-dont-we-use-ch... TLDR: They hit you just as hard as they hit the enemy and they are wildly unpredictable.