This is all such a gray area, and you have to ask yourself, is it worth potentially missing your flight, or facing criminal charges? The fact of the matter is, if they decided to give your MFLB a swab with a testing kit, it would come up positive and you would be under arrest. Sure they might see the tobacco products and the product explanation and pass you off, but is your time, freedom, maybe even your very asshole worth that risk?
The sad fact is,
there is no way to really clean the MFLB.
Completely random baggage searches are a completely commonplace thing in airport security, so don't think they have to see a Volcano in your bag in order to actually have your vape before them on a table, surrounded by other security goons smelling and poking at it.
The only vape that I know of which can be completely, utterly cleaned is the Vapocane. You could carry a sterilized vapocane, an unused pack of screens and a empty jet lighter, and that's about as safe as I figure you could travel. When you arrive you could put it into an apple or something and improvise a stem for a mouthpiece.
You'll love NYC by the way, it's my favorite city in the nation based on a three week vacation there. People are ridiculously friendly, it's totally contrary to the stereotype. Coney Island is a trip, make sure you go, and the museums are absolutely out of this world - do not leave that town without seeing the big ones like the Met and the Gugenheim. Do you know about City Pass? You pay an upfront fee for a fat stack of free or discounted entry tickets into all sorts of museums and sites - mine paid for itself by day like 4, literally. It's a great deal so look into it.
One thing I'll say while we're on the topic is that I'd feel way, way better transporting anything iffy if I were traveling within Europe. European customs IME are kind, efficient, gentle and nowhere NEAR as stringent or invasive as American customs.