To date: 700-800 dollars give or take.
I vaped from late 2008-2010.
And again now from July of this year.
Most of the cost came from bad purchases early on.
you know, the 150 dollar Smoke51 kit from a mall kiosk that lasted about a week lol ( my first vape ).
Then I bought 510 batteries/pcc, only to figure out it wasn't going to suffice to keep me off cigs and I needed an Ego setup.
(that's about another 80 bucks or so down the drain, but I can't knock the cig-alike 510s they're pretty good.)
Now I got hit pretty hard this time buying good batteries/charger/rba and a kick 2 for my 20 dollar mechanical mod comin in.
(about 140 bucks all together)
10 lr attys and an evod/some atty heads = 60 bucks (but pretty useful).
the rest of the money is just juice and odds and ends stuff like a multimeter/wicks and coils.
All in all though, at this particular moment, I'll still be ahead if I manage to stay of analogs for the next 6months (and my smokes on the reservation are only 3 bucks a pack), so who cares ya know.
i just throw stuff on the credit card and pay it off at my own pace. i've got a low interest rate, so making a credit card payment is like buyin a carton of smokes, no different really to me.