I've been vaping for about 11 weeks. Most of that time, I was still smoking (though smoking quite a bit less than I had been before.) For the past few days (94 hours) I haven't had a cigarette.
I've kept an exact count on what I've spent on vaping stuff. My eGo starter kit, atomizers, cartomizers, tanks, fluid, shipping. My vaping total is 372.58. That includes everything vaping related with the exception of paper towels.
And I'm pretty stocked up, with juice, and backups for everything except the battery charger. I suspect I could go for a month without placing an order if I needed to.
My last order was a week ago, and when it came in, I did some math. It's just an estimate, but I've got a good idea of how many cigs I was buying before I started vaping, and how many I bought while I was vaping. And of course, I know how much I"ve spent on the vaping stuff.
As of a week ago, I estimated I was about $100 ahead. Also, based on my old habits, I'd have bought another 2 cartons of cigs to get me through that week (I was smoking 3 PPD), and I was paying $40 a carton (for off-brand cigs.)
So right now, I'd estimate I'm $180 ahead. But I'm really farther ahead than that, since I now have juice and cartomizers and batteries and such.
And the big thing, of course, is that a I'm no longer smoking. It's too soon for me to think of myself as a non-smoker, but so far, it's working well.
Based on what I was spending before, in theory I could buy a mod a month from now until eternity, plus whatever juice I need, and I'd still never spend as much on vaping as I was spending on cigs.
In practice, I expect to get a Buzz Pro fairly soon, and maybe one more VV mod after that (so I know I have a backup if something happens to the Buzz Pro), and then I expect to quit buying mods.