

It’s a brutal war and medical supplies are being rationed, if they exist at all. When hospitals don’t have meds, or can’t give rationed meds to lower priority people who are suffering, those desperate people resort to smuggling.
I’m sure there are also addicts who can trade influence or high value items for oxy, but my money on this being for the sick and dying.
This always happens in war.
It was in pill form. My money is on people smuggling meds for the sick and dying because they can’t get rationed meds from hospitals.
This wouldn’t be the first time desperate people resorted to smuggling meds during a brutal war.
If someone wanted to poison people, there are much cheaper and more effective ways to do that.