Moreover, certain types of marijuana do a superlative good job of providing non-opiod relief from chronic pain and aren't psychoactive, so in the same way you or a co-worker might have some Tylenol if they're feeling physical pain while at the office, you or a co-worker could use marijuana to manage chronic pain, without their mental state being noticably altered.

That's not to say marijuana cannot be abused nor is it a silver bullet, but in the middle of an opioid epidemic, holy shit, maybe something many people are illegally using to manage chronic pain without causing an epidemic; maybe it might be worth studying? The vast majority of users continue to be productive members of society; judging by the number of states that have legalized marijuana, we should be in the middle of a marijuana crisis compared to opioids, yet no such crisis exists. Yet the DEA classifies marijuana as having zero medical benefit, which makes it almost impossible, practically speaking, to study properly.