"No, it is not useful to create new generations of nicotine addicts, but show one piece of evidence that that is what happening."
The whole point of this is that it is too early to say, hence being responsibly cautious.
"Multiple studies have shown that vaping is not acting as an gateway to smoking; non smokers are not becoming vapers."
Do you think that the companies who profit from vaping will be happy if that situation pertains forever?
There is a strong anti vaping lobby, made up of "health" professionals and tobacco companies
But vaping companies are behaving to the strictest of ethical standards and always putting the welfare of the population before any thought of profit?
And always will?
blu eCigs was bought by Lorillard Tobacco then Imperial Brands (formerly Imperial Tobacco), R.J. Reynolds Tobacco owns Vuse, I am sure there are more links between vape companies and tobacco and that these links will increase (it would be stupid of tobacco firms not to control this market).
So I don't think there's any harm in our regulators keeping an eye on this market and making sure that we don't allow the undoubted benefit of getting tobacco smokers to do something less harmful to be followed with unintended negative consequences in the future.