Chemical weapons have been outlawed internationally since the horrors of World War I. My great uncle never fully recovered from a mustard gas attack.
Chemical weapons are largely uncontrollable. They are outlawed and should stay outlawed. We can use bombs on jihadis and their hideouts.
So then the USA should use bombs in jihadis instead of supporting them as it did under Obama (thankfully, Trump stopped it) — and if Assad wants to play dirty with jihadis, let him