Everyone is different. When I smoked, I could never cut down from my natural 2-3 PAD habit. I could never smoke 2 or 3 cigs a day, over the long haul, without ending up at 2-3 PAD again. Although I never fully tested that while vaping too.
I was introduced to vaping at a vape shop. Within a day or two I stopped smoking, for a few days. I was out of town by myself. I went home, where my wife is a 2-3 PAD smoker too, and started snitching her smokes, and within a month I was back to a pack a day. A short time later I decided I would never take a single puff again on another cig, and that was July 31, 2014. I was totally committed to the idea, and I really enjoyed vaping.
I have yet to take another puff. The 4th or 5th day was REALLY tough. But after I got over that hump it was all downhill sledding (easier as time went on). And now, a little voer 6 months later, I rarely get an urge to smoke, maybe a couple times a week at most, and it is not a bad craving, just more like wistful thinking that passes quickly after I vape some.
That was my experience. I think you have to get good vape gear, whatever works for you, and be willing to spend some money experimenting with gear and juice. I would suggest, at a minimum, something like a good eGo battery and a tank like a Nautilus or maybe now a Kanger subtank, which is my current tank of choice.
And then you have to reach down deep and just decide that you are not going to ever smoke a cig again, just do it. You have to have that level of commitment. It has to be more than "a nice idea".
That was my experience, you will read different variations of that theme. I suspect that the more dual use you do, the harder it is to quit. It was easier that first time, than the second time, and I would be afraid of how much more difficult it would be if I went back to smoking and had to go through that again. I don't ever want to go through that 4tyh day again, ever. Smoking is much about a long ingrained habit. I suspect it is better to make a brand new habit of vaping only, than to dual use for a long time and then try to break that new habit.
Good luck in your venture! You *can* do it. If you really want to.