Six weeks vaping, about five without a cig. Tried vaping a couple times before, but didn't take until this time around. The gear is just so much better than it was 4-5 years ago. One thing I felt on my previous attempts and now is (and this of course is my experience, YMMV):
Vaping will not catch up to your mic cravings. Don't wait until you're jonesing to vape. Especially in the first few weeks. Stay ahead of the cravings. Find a flavor and setting that you like and make sure it is always within reach.
A couple other things to consider:
-Take advantage of the fact you can vape where you couldn't smoke (if that's the case for you).
-Vape in those little moments when a cig didn't make sense (between the car/bus/train and the door, or walking out of one shop into another). Just a little hit here and there will be keeping you mic levels up there and fending off the beast.
-Take a Vape Break, like you would have a smoke break. This sounds a little contradictory to the above, but it's more complimentary. If you used to go outside for a smoke at work, go outside for a Vape. It might be handy in satisfying that behavior part of the habit. I was using a Naut Mini as my pacifier, and a subO setup for my breaks.
Even then, it may not cure all cravings, because like others said, there is more than just nicotine in cigarettes (and all tobacco). For me, the success came with forming a new habit, Vaping to replace my old habit of smoking. In a week or so, the cravings became what i described as longer or deeper, but less acute. Now, a bit more than a month later, I still miss that little buzz with the first cig of the day, but have found juice/gear combos that keep me amused and distracted enough that that little feeling of emptiness and longing passes.
Finally, as mentioned earlier, Snus might help. There are other psychoactive alkaloids in tobacco that are not in e-juice, not even the Naturally Extracted Tobaccos. Some folks are able to walk away from cigs with the nic replacement of patches, gum or e cigs. Some folks have a greater need for those other components. Snus has those other bits and has proved quite useful in curbing smoking in Sweden. There are also a couple of vendors for WTA, or Whole Tobacco Alkanoid e juice. It's pricier, but it some people seems mighty impressed by it. I have not tried it, but I am considering it, because I have heard it has the calming effect of smoking.