I'm not gonna criticize your choice of who you follow or what they had to do to quit smoking. But I'm not gonna recommend anyone to do the same. If you think you need to ween yourself off of nicotine slowly then you will have to do it slowly. There are many factors to consider but they all stem from your thoughts and nothing will work if you don't believe it will. Most smokers I know that quit after vaping went straight to 12mg nicotine. Two of them went up to 18mg but still refrained from smoking. I don't know anybody that has quit vaping yet, even the few that have gone zero nic. I know of one vape shop in this area that starts most of his customers at 12 nic and getting it done with comparable results of another B&M that start's her customers off at 18. I started my MIL at 6mg and she quit after a week. She had a 60+ year addiction. Don't underestimate yourself. Good luck and I'm happy you quit the cigs.
Now after reading this post I am totally confused as to what your point was before, as now you seem to be more in line with what I was told to do to quit. Especially the part in bold...
I did the 24mg for the first week, to make sure I didn't have any cravings, then I went to 12mg. Now I'm down to a 6 and I've been there and happy for about a month now... and not a single craving for an analog. Seems like the shops in your area suggest a similar approach since you stated "they start most at XXmg", leading one to believe that at some point they step down their nic level and continue to do so until they're at a 0.
SO... where do you, or the local shops you spoke of, differ with what I was told?