Retired in August 2013.
Surgical physician's assistant and RN.  Primarily a first assistant in the operating room, the surgeon's second pair of hands during surgery.  All types of surgery except for open hearts.  I would stealth vape in the locker room or bathroom stall as there was no smoking on the hospital campus; a co-worker said the locker room always smelled better after I had a vape.
The "on call" thing was part of the job.  Emergency surgeries in the middle of the night, and then expected to be back at 7 AM for the day's first scheduled surgical case.  I don't miss that part of the job at all.
Was forced into early retirement due to a physical disability -- "excessive sleepiness" (I wonder why after 35+ years of being on call?).  Worked in a vape shop part time for a year after that.  And yes I could vape at the vape shop.