i probably have the record for longest. it's been over a year since i first bought my 510(back when it was "the best thing since sliced bread") and i'm still not off analogues completely. there's a part of me that simply doesn't want to quit. e-cigs are the closest thing to ever get me within arms distance of quitting and i'm trying a lot harder these days to quit. i'm young and my body hasn't noticed that i'm killing it yet. but even e-smokers will admit it's not the same. there's something about the fire that makes it hard.
however, if you're serious about quitting, this will get you there, guaranteed