Why not explain to your managers that your e-cig is a kind of nicotine replacement therapy that is helping you to give up smoking and explain that it isn't smoke but basicaly steam. ....the fact is there are 'no' laws against vaping and they have no real reason to disallow you to do it.
I've been doing this all week at my desk at work. I don't do it at client sites or in front of patients, its just too time consuming to explain it and plus, it doesnt matter what the truth is when it comes to customers; you simply just dont take risks like that in my eyes.
After a week of doing this at my desk, one of the other guys in my office caught me. He asked about it, I explained. Now see, MY manager is ok with it, he thinks it's great that I am using this instead of tobacco. However, another manager overheard the conversation and next thing I know, my manager secretly shows me the emails flying back and forth to HR. The other manager is explaining how I am "smoking in the building and it smells awful". My manager is still Ok with it (he is a non-smoker who suffers from severe asthma)
I'm willing to fight for this one for more than one reason. My manager is ok with it ( I filled him in on it before I ever used it at work just to cover my bases) and so are the other people I work with minus this one manager. I've been treated like a second class outcast for years because of smoking; you all know the feeling. Now when I try to do something about it the problem is instantly a visual thing. Everyone admits they can't smell it and after realizing they are only seeing VG vapor, they don't even care about that. In fact, they generally think its pretty cool. If any of them kindly asked me to not vape around them, I would comply out of respect even if I disagreed with them technically they simply dont know for sure what it is. I get what I want and so do they. But what I refuse to do is fold to idiocy like this, a distant observer with a mission.
Quite honestly, I knew this was going to happen eventually and I welcome the fight. So, take care that you keep on sneaking it unless you are also ready to take up arms.