This is a valid point, but at the same time we could say, how are so few people able to quit using traditional nrt? In theory - if the main factor in smoking addiction is nicotine - as I understand it, it should actually work better than vaping, given the rates of absorption of the various methods of administration.
As I said earlier, the tactile aspect and just the sheer habit of smoking when you do - after meals, out for a drink etc are grossly underrated in all other cessation methods. I don't pop out for a vape because I'm craving my 1% nic, it's because that's what I do - what I've done for 34 years.