I work in a restaurant and the GM is an ex-smoker and is fully supportive of my efforts to be healthier. We do have a certain little shift manager with a serious inferiority complex who enjoys butting in and telling people what to do simply to try to be controlling who has tried to forbid me from vaping at any time on "her" clock. Also claims that it's unfair to the employees who smoke analogs because they're not allowed to get "their fix" as she called it.
After a sit-down with the GM about this, among other things, we have a "don't ask, don't tell" policy of sorts. Had to remind the assistant manager that what I do in the bathroom, etc. is no freaking business of hers and that continued questions will result in a complaint against her. Not an ideal situation, but it's less related to e-smoking itsself and more related to a very insecure little person trying to throw her weight around be in control.
Such is life.