For me it took finding the right ecig - with the first set I bought, it worked most of the day but found I was craving a "real" cigarette when I got home.
Bought a 2nd set and it was much of the same - able to get through the day, but....
so, I took a break and finished off the tobacco I had in the house ( I was making my own) and then I opened the new package I had from V4L.
Never turned back - I threw out the final bit of tobacco I had and have been fine ever since.
Doesn't even seem like I've quit smoking, I never miss having a "real" cigarette.
I figure I spent $250+ finding the right system, but to me that's fine - I've smoked just about 35 years, NEVER, EVER thought I would be able to get off cigarettes.