I don't know about anyone else, but I remember my first week to week and a half after my last analogue I felt like there was something missing. I wasn't craving nicotine, but vaping wasn't 100% as satisfying. My guess is that one of the other hoards of chemicals in cigarettes is also mildly addictive, as I was never tempted to smoke a regular cigarette, I just wanted something that I wasn't getting from vaping. After that initial bit, it went away and I've been absolutely content to just vape, haven't had so much as a hint of an urge to go back to regular cigarettes (and even hate the smell more than ever). I started recommending that people start vaping with 24mg juice, simply because that way they play it safe. If it's too strong, then they can just vape less frequently, but chances are they won't have issues with it being unable to keep them from craving nicotine or cigarettes after vaping. Once you've done it for a week or two, then you can kind of get an idea as to what strength you need, based on how much you needed to vape on 24mg to satisfy your nicotine cravings and go from there.