I am coming from a Canadian perspective, so it might be a little different.
I think the bigger problem in the US is the tobacco MSA bonds. The TMSA bonds put State budgets in direct conflict of interest over Tobacco reduction and cause them to financially benefit from the sale of deathsticks. I don't see any bond system in the Canadian settlements. I think a lot of the anti-vaping US government activity is a result of losses in the TMSA bond market (
Moody's places 31 tobacco settlement bonds under review This makes for a weird array of allied interests few could have predicted.
As time goes on and hopefully vaping is proven to be minimally impactful on public health over the long timeframe, the anti-vapers will have less ammunition. There is a lot of positioning going on up here in regarding regulation and access but if I read it right its about public health more than public finance. Will they tax it? Probably. But retailers are paying federal and provincial taxes on sales too. Hard to ignore that revenue as our provincial governments are all but broke at this point.
The big stink up here is "unregulated" nicotine which is in fact regulated - there is salability of nic under certain concentrations and now there is a lot of handringing going on about that. Fact is nic extraction is a relatively easy process. One only has to look at the utter failure of criminalizing Head shops in Canada to see how unwilling authorities are in pursuing these kind of trivial operations. ANTZ will always be ANTZ, nothing you can do about them other than keep fighting. The really annoying thing is municipal anti-smoking bylaws that place vapers in the same space as smokers. I don't work downtown or in an office so its meaningless to me, other than offensive to my sense of personal rights and freedoms - and there are worse things like Bill C-51 up here which is like the Patriot Act on steroids. Bigger fish to fry.