OK, that's nice except agent Orange is not a chemical weapons. It's a defoliant that later was revealed to have some bad side effects. Complain about mass defoliant use if youd like, and nobody can argue, but if they had been dusting with round up, and that turned out to have a carcinogenic side effect, that wouldn't make Roundup a chemical weapons either. Sarin, mustard gas, etc are anti personnel chemical weapons banned for decades under international convention because they are used to kill and kill horribly. Agent Orange comparisons to that are disingenuous and embarrassing.
Agent Orange was bad. So is DDT, coal slag, and on and on. They aren't chemical weapons.