I wasn't an ultra-heavy smoker, though I did smoke full flavour (i.e. non light - Players Filter / Export A Green) smokes, about 12-13 (half a Canadian pack) a day. Got my first kit April of 2011, and used it somewhat for a month or so, but set it aside as the cartridge/atomizer combo of the eGo XL didn't blow me away... got some Boge cartomizers and a 510 tank and carts in November, and by mid December I found myself smoking maybe 1 or 2 analogs a day before very long. I didn't want to quit cold-turkey for fear that I might jump straight back to smoking.
The long and the short of it is, had my last analog Dec. 31, and one cigarillo on Jan. 1, and have been totally tobacco free since. I occasionally get the rare craving for a cigarette, but a vape or two cures that, and I wonder why I didn't quit sooner. I've since got a Lavatube VV mod, a ton of juice, doing my own DIY juice (just got a 4L jug of PG this morning in the mail for cutting), and all the other cool doo-dads (dual coil cartomizers for tanks, low resistance cartos, high res cartos for my VV), and still spend less than what I would have spent on cigarettes.
For those of you who can't quite get away from the nasty weed yet, don't fret, it took a bit for me, but I haven't looked back since! Good luck to you all and vape on!