Re: An experiment??
As for tobacco products, I suspect that governments are as addicted to them as any other for the tax revenue they produce. I don't think you will see a ban on them anytime soon.
Therein is the crux of the matter here in the States. How doe it get taxed? States started raising taxes on tobacco products to discourage smoking. It worked. But then the revenue fell off.. so they raised it again. Cue up "chasing the tail".
About two years ago, customs was impounding shipments for China as no one knew the duty on them. It got sorted but I'm not sure the category these things fall under at this point.
There's a couple of States working to re-write their laws from "tobacco products" to "nicotine products" but there's an issue with the patches from places like the medical world.
I won't even get into big pharma and big tobacco as other commenters have done well on this. But taxing e-cigs and vaping products is a problem... for the collectors of said taxes.