The problem with ecigs is that they are way more polluting than regular cigarettes, due to all the plastic cartridges from the liquid and the batteries in the ecig devices.
So regardless of anything else, it’s good that ecigs are banned as much as possible.
That’s a bit like saying “I wish I had had the idea for a search engine before Google, then I would have been the next Google.” It doesn’t work like that in business.
You could have given Microsoft everything they needed to dominate in mobile and they still would have screwed it up because of the Microsoft mentality back then. Even after iPhone came out, Ballmer famously said iPhones were stupid.