The first time I switched over to vape-only, it was very easy, almost didn't notice the cigarettes just going away.
However, the 2nd time, after my relapse, was a great deal harder. It really took a huge effort of will, and of constantly reminding myself that I really did want to return to being a non-smoker. As long as I permitted myself ANY possibility of a smoke, my stupid brain drove me crazy, plaguing me to go smoke, go smoke, just about constantly. But as soon as I said ENOUGH! and took even the possibility completely off the table... that 2 yr old in my head shut the hell up and quit bothering me. I finally laid them down again while I was still at 5 per day, simply because a) I knew it was possible, I'd done it before, and b) I knew that the longer I allowed myself to keep smoking, the harder it would become to ditch them.
You just have to decide, and stick with it. An e-cig isn't a magic wand, or a substitute for a firm commitment -- it just makes the commitment easier to live with.
Andria