The only thing I can think of is the relatively unfettered access to some highly addictive controlled substances. These substances are very useful for patients undergoing surgery, but they do not have access to them outside the OR.
I remember in residency that there was some testimony from prior anesthesiology practitioners who were reformed addicts who warned about the highly addictive properties of newer anesthetics such as Fentanyl, Sufentanil etc.
Other than that, I do not know...
Thanks. I had considered that possibility. Access.