My manager caught me vaping in the open and asked me what it was. I immediately had to come up with something that wouldn't get me in trouble. After explaining what it was, how it worked, what it costed, and where to buy them, he grew even more curious about it. But never once did he ask me to stop. And I work in retail!
Our workplace (a central UK government department) has no policy against vaping. But rather than just start vaping in the office, we've approached property management, Human Resources, the union, and the health and well-being committee. Three months on, they still can't make a decision and push the ownership of decision making round to each other (though the union are fighting the case for us). What they WON'T do is come and talk to us to find out more, which I find rather frustrating and irritating. I'll give them another week and if they do not respond by then, I'll just carry on in the building under the presumption that I've asked, got no reply, so thought there was no objection. I bet that'll shift them to make a decision.
I work in a hotel and neither the general manager or the assistant general manager care if I vape as long as I'm not where guests can see me if I do it inside the building. They both are actually all for me vaping because it keeps me from smoking analogs. The agm is currently looking to start vaping after I and 2 coworkers of mine (one uses a greensmoke setup, I'm in the process of getting him to switch to something more reliable and economical) suggested he try it and offered ours for him to try out.