I've traveled all over the US, to the UK, and to Russia since I started vaping, without any issues.
Just be sure the batteries and tubes are in your carry on, and any liquids and tanks are in checked luggage or a quart sized bag for the security checkpoint.
I have had issues with tanks leaking on airplanes, but this is generally alleviated by opening the tank to the air for a second to equalize pressure once you're airborne. If you don't want to do this on the plane, then leave the tanks about half full and in a baggy.
FWIW, I've vaped in the airplane lavatory many times without issue. Mind you, I didn't sit in there and make huge clouds, nor did I ask permission either. Just discreetly took a few good hits to get me by
