I have been vaping at work for a couple of months. Been vaping for six. At first id did it outside to get a break but when it got busy it was easier to vape at my desk in the cube farm. My boss saw me vaping and asked "Is it ok to do that in here?". Told him "I don't know, I never asked." He hasn't bothered me since.
I try to be discrete but I have been caught a couple of times. If they ask about it I explain, if they don't I just put it aside and take care of business.
Works for me.