a friend of mine quit after 10 years, and has no cravings. i think its only mental issue, you just need to fully accept that smoking is no good, and your mind will stop tricking you into thinking that you want it
It depends on how you gave up. I've given up many times and always came back. The last ime I used Allen Carr's book and it helped me realise and teach myself that I'm not "giving up" anything. The trouble with thinking that way is seeing that you're depriving yourself of something. You have to realise what the act of smoking is (and what it will deprive you of) and then see that not smoking is providing you with things that smoking deprives you of.
I recommend you read that book. You need to realise, as I finally did, that when you're "giving it up" and waiting for the moment of no longer being addicted it doesn't arrive. When you stand against them and look at them and the addiction for what they are, the craving to have a fag just disappears.
I look back now (1 year or so off the fags) and actually can't recall when I stopped missing them and when I realised I was free from them. I just know that now, even when drunk, I'm actually opposed to, even angered by, the idea of having a fag. Shift them paradigms and don't give in.
Look, nicotine is out of your system, you no longer have a physical addiction. If you have one here or one there, suddenly you slide down that slope into a full blown smoker again, which sucks sooo much. Few smokers, if asked would they have started smoking if they knew what they know now, would start. So why start again? There's no positives. (Also, try to avoid replacement, because you're masking over the issues. Tackle it head on and tell your mind to fuck off.)
My grandfather still felt regular cravings after 40 years off cigarettes...
They only got less and less frequent but never went completely away.
With eCigs the trick is to start with full nicotine and work your way down to zero over a period of months. Don't go from cigarettes to zero as it wont work.