The mental state that you have about vaping and quitting is important. I continued to smoke for a while after beginning to vape (went from 50 a day to about 6 or 8 the first week). That allowed me to convince myself that vaping tasted better and was satisfying. I proved the satisfying part by vaping a little harder on my 24mg juice when I thought I needed a cig. The craving would go away.
One day, I just decided that smoking and vaping was silly. I had already compared and decided I wanted to keep vaping. I woke up one morning and decided I was through with cigs. That gave me a mental state that assured me I was done with tobacco. Past that point, I have been able to sit next to someone who was smoking, enjoy the aroma sometimes, but not want a cig. It's like magic when you wrap your head around quitting and embrace the fact that you are through.
Staying off the cigs is good. Vape heavier when you have a craving, but don't kick yourself if you give in and smoke one. Keep it at a low consumption rate and compare the two for a while. One day you will be able to quit with assurance.
You might, as someone has already said, be vaping at too low in nic. Most people who need more vape 24mg juice. Some start out at 36mg and taper down to 24mg and continue downward. Find the juice you like with a nic level that takes away the cravings and you are set.