i would not be surprised if this came to pass but the government and the next one have already plans in place.
however out of those 4.3 million vapers half don't know whats going on a third of the rest of the remaining half don't care and I would say an eighth of the what remains will say they will do something then won't, what remains, say, a couple of thousand may or may not sit down write letters to there mp might protest might well join groups, etc but I expect not history says the UK public just chug a lug it down, like the post office scandal innocent people committed suicide, families, businesses were destroyed and they are still waiting for justice.
but if the MPs got 20 -30 100- letters from their constituents each..... about flavours that might sway them.