I have a second job at a customs border crossing. I only work a couple times a month but when I first started vaping, I brought my PV into my supervisors office to show it to him and explain (no point in hiding it cause we would always go out for a smoke together). When I showed it to him, he wanted to know how it worked, so I demonstrated, you should have seen the look on his face when I puffed out a cloud of vapor in his office! He told me to do it outside and be discreet about it. I go to the back of the building where the public can't see and where not many officers go, and the ones that have seen me have been cool with it.
I read your question this morning before I left for work and it got me wondering. I have never heard any talk of PV's there so I wanted to know what the rules were regarding people carrying them across. So I went to talk to the head supervisor, nice guy, heavy smoker, and easy to talk to. He had heard of them before, never seen them, and didn't think that they existed in Canada. He had no idea what the rules were regarding them. I told him that I had one and explained it. He was very curious how I liked it and how it was working for me, how much it cost, etc, (sounded like he wanted one, lol). I don't know if he would be able to use it publicly being in the position that he is in? Anyways, he said if I drove through with mine, I would not have to claim it as a tobacco product because its not, and if he happened to come across it in a search, he probably wouldn't even know what he was looking at, and even if he did, he would let it through. Then he referred to a colleague, who knew more about them and the ban, and he said that he would absolutely confiscate my PV if he found it, lol. I don't think he is aware that the ban only applies to nicotine because there is nothing illegal about carrying around a PV?
So I guess while PV's fly under the radar up here in Canada, most customs officers will not know a PV from a mile away. Most probably don't know that what nicotine juice is, let alone that it is banned and they are supposed to be confiscating it. Once they gain some popularity we may run into some problems with this. All it will take is one internal memo and a bit of education regarding them and they will crack down. In the mean time, follow the advice posted by others: don't mention it unless they ask, don't vape around customs officers, bring spares, separate your items out among your bags, be honest when asked, and if you can, try to have bottles that are labeled discreetly (I know some of mine say in big letters THIS PRODUCT CONTAINS NICOTINE, lol.). It is better to be safe than sorry! Hopefully you won't run into one of those rare officers who is educated on PV's and the ban.
so you have no worries. By the time I was finished explaining myself the guard wanted one himself 
