Dioxin, produced by Monsanto, has also been used by Canada's DND, Ontario Hydro (I saw a few miles of orange trees along power lines) and I've read the stories of women who bore children with deformities after being exposed to it in British Columbia.

It is a herbicide that has detrimental effects on humans and other living things. While it is difficult to perceive it as a chemical weapon, it is still nasty stuff. For chemical weapons to be effective in battlefield conditions, they have to act fairly quickly.