I'm in the opinion that they will just regulate juice since that's where the nicotine is. And they won't regulate the mods. Or is that like atf regulating the sale of bullets but not guns? By the same token. Certain shops can sell equipment for smoking a substance I won't mention on here. However that seems to be hardly regulated and certainly isn't banned.
They will regulate and/or tax anything they can. The ATF does regulate bullets, look up Black Talon, mercury ammo, there is a limit to how a bullet can be manufactured. Pistols cannot fire amour penetrating bullets, they had a time when 5.56 ammo was hard to get due to this but then started sales again. The shops you talk of market it as a tobacco device but when the police pull you over it's called paraphernalia and you can get a fine for it, lol. People make laws people find ways around them, it's been that way for a long time. Have you ever went in a gas station and seen the little roses in glass tubes? Right next to them they usually have "tobacco" screens, ever wondered why or who buys mini roses in glass tubes?

