Hope your son heals quickly!
I vaped in an ER too, and 1 of my docs vaped.
That same hospital in NC lists "nicotine inhalation device" as allowed during hospital stays. I tested that after surgery in a 2 day stay. I never vaped while anyone else was in my room, and asked every single doctor and nurse in charge if it was ok. MOST knew what it was, and they had no problem with it.
1 nurse got bureaucratic on me and called the pharmacy. Pharmacologist came to my room, looked at it and said it was fine.