I stopped smoking the day before my ecig stuff came. What helped was that I spent all that weeks "smokes" budget on the ecig gear and couldnt afford to buy any more cigarettes. So it was that or nothing till next payday. The first week I used them was fine. My first setup was 2 510 batts from Volcano (magma), a couple 510 attys, a PCC, and my juice was Tobacco Menthol from vaporrenu, and Blue Bulls from Tastyvapor. I think what helped me not go back was the red bull juice, it was super strong. Then menthol was good in the am b/c I used to smoke Marb Smooths. That was Aug 2010 and I havent had (or wanted) a cigarette since. I soon moved on to an ego style manual battery, then an Omega and other mods. If I had to give advice to new people trying to make the switch it would be to not skimp on cheap equipment. Dont get 510 batts and an atty, get a manual ego style or other mod and cartomizers. Cartridges are going by the way of the Dodo, there are just better delivery systems.. Also, get juice from a company that makes quality stuff. IMO juice is like cigarettes. The cheaper the juice, the poorer the quality. Like, that vaporrenu stuff is only 7 bucks for 30ml, but it really shows when you compare it to something that is like 25 per 30ml. Tastyvapor is where it is at for your first juice purchase, their stuff is really strong at 24mg and flavorful and only 15 per 30ml (last time I bought from them).
Keep in mind when looking at your initial costs that it will seem like a lot in the beginning b/c you are just getting set up and finding what you like. You will find stuff that is just no good and will need to replace it asap. Once you find your favorite juice and your favorite equipment all you need to buy is replacement cartos/attys/tanks and your juice... compare just those costs to what you spent on cigarettes. Its quite a bit less.