Well, it's not illegal, so it's kinda like legal, isn't it?
That said, if e-cig industry were to be regulated, we could definitely see some improvements in the products out there. Today, there is no such regulation, so quality control is somewhat lacking. E-juices with inconsistent flavors, attys that burn out too quick, cartos that leak, etc. These are some of the unknown quantities that vapers have to contend with these days.
Quality?
I don't think regulation would change a thing except for adding a 15-20% markup to the price, a tax, so to speak.
Inconsistent-tasting flavors, would be the last thing to concern our Gov't. The only thing may be is that every batch of juice would get tested for industrial contaminants, and that's about it.
-[Arsenic]