It's weird hearing how other people have such a hard time transitioning, because for me it was instant and effortless. As soon as I got my first ego set, I was done with cigs, no overlap whatsoever. Not even that first day. Granted I started on 24mg, still vape 18mg, and don't really plan to reduce any time soon, and there are a couple flavors I keep around for the few times I DO miss a smoke, but even those don't really taste much like a cigarette. I wasn't a light smoker, either, 1-2 packs a day, at least, for 25 years. I guess I just got lucky. Maybe the difference was that I had every expectation that it WOULD work. That whole positive mindset thing. At any rate, I hope your friend comes around!
I think the nic level is very important. If you have the right nic level, I think it's fairly easy, and if you don't have the right nic level, it's very difficult. It sounds like the 24 you started with was the right level for you. I was a 3 PPD smoker, and they had me start at 24. I cut way down, but was still smoking. Only after I moved to 30 did I quit - and once I had the 30, it was very easy to quit.
I started vaping Friday, 07/15/2011. I quit smoking 10/06/2011. So it took me 2 and a half months to completely switch. The first month, I wasn't really working at it, but the last month and a half or so, I was really trying. If I had started with higher nic juice, it would all have gone much faster and easier.
MJTP: I quoted you, and bolded/red the sentence that describes what worked for ME. I do see posts here from people all disappointed in themselves that they "haven't quit yet" or "went back to smoking" like they are a *failure*. They are NOT failures, and if a person can get this mindset not to pressure themselves, but to think of it as a "new hobby" they are trying, they will enjoy it lots more. That's always a good thing: to enjoy the things we choose. Thanks for saying this.
When I started vaping, I was told "It's OK to do both. Don't consider it a failure to light a cig, consider it a success when you don't. It's OK to do both, just stick with it. If you keep vaping, then as time goes on, you will just naturally quit smoking". I didn't really believe any of that at the time, but I sure do now.
There was a sort of "light bulb OMG!" moment for me once when I had been doing both for awhile. I lit a cig by accident (just a habit thing without thinking) and as soon as I took a drag I thought "Darn, I didn't need that, I should have just vaped". That was a turning point for me, and when I look back on when I really believed that vaping was going to get me to quit smoking, that's where I really started to believe. After that, I started putting my cigarettes across the room so I couldn't light them out of habit, and keeping my PV on my desk or in my pocket or whatever was most convenient.