I am about two weeks in. I started out with 12mg and 18mg liquid, and just bought some 24 since I found myself wanting to vape ALL THE TIME. Most of the last few years I was about a pack a day, but I'd been smoking for 30 years (I'm 44).
Generally, if I am sitting at my desk while working, I'll take a few drags every 20min to half hour. While I'm at home, watching a movie or playing a game or some such, I'll vape as the mood arises while I used to smoke at least 1 analog an hour (sometimes more, sometimes a little less). Since going over to the 24mg, I'd say I don't get the "craving" nearly as often, but I enjoy the sensation and the taste.