Throughout history, the only viable restraint placed upon the endless addiction of greed that afflicts these social parasites has been the willingness on the part of the peasantry to dispense their ammunition into the flabby morass of their putrid, pompous hides. In modern 'civilized' times, there seems no such effective check in place (not that such was ever wielded very efficiently to begin with!). That being said, our modern tyrants would likely run into the same problem with taxation and regulation of these products that they would had they attempted to regulate caffeine, coffee, or the coffee pot. Imagine that daunting task! People would go batcrap crazy if you tried it and would get their fix one way or another. Just look at any other drug out there that millions of people across the world are hopelessly addicted to and you can readily understand the inherent difficulty in alloying taxation to something you can get from a Backstreet alley, bedroom closet, or mountaintop! There is so much money to be made here, and they care not one whit for your health or well being, but how can they enforce it effectively? With tobacco, it's relatively easy. People have been hooked on it for generations, it's not very efficacious to grow yourself and it's been one of the staples of our economic stability for centuries. Hell, smoking, snorting, and chewing things that destroy you and the environment is as American and patriotic as it gets if you're into such nonsense! But now you have the internet, local stores in every major city, people distributing legal, non harmful products from their basement, and users who can design or mod their own products... At best, you can avoid the entire issue and, like drugs, merely, ineffectively outlaw them.
Edit: Another relative issue in this regard is public opinion upon health and the concern on the part of the wealthy that their precious little pets are sane and functional enough to work, consume product, and not ask too many questions , further reducing the likelihood of too much inconvenient meddling in our
vaping affairs.