Tho interesting to track you'll find that the saving portion wont hold any truth if your like most of us. In the long run money spent on accessories and upgrades cost more than you save......but you can't put a price tag on good health!
Unless you have a way of skirting around tobacco taxes or order ciggy's by the truck load somehow...I think it is very very possible to spend WAY LESS with the PV than on smoking.
My state has some of the lower tobacco taxes in the union, and even the generic brands are over 30 bucks a carton now. Add lighters...and all the messes and damages caused by smoking.
Example: Smoking tobacco in my house...one room reserved for smoking...I ruined this room and everything in it. Curtains, carpet, all upholstered furnishings. Smoking just made everything in it nasty...plus the occasional burn accident! Just cleaning this up with a fresh paint job and cheap walmart window blinds cost over $400 not counting my time and labor.
Example: I once had a cherry fall from a lit ciggy. It landed on someone's $1,200 swimming pool cover! It cost me $300 to have it patched/repaired (luckily it was a friend who also smokes and he didn't make me outright REPLACE the whole thing).
Example: The trade in value of every car I ever smoked in went WAY DOWN.
In contrast, for $400 you can buy enough vaping stuff to last a very very very long time! That's even if you get a fancy mod or two and have a juice tasting spree for kicks.
Sticking with stock stuff and a few favorite flavors in bulk...vaping can be WAY less expensive than real smoking...not even counting 'smoking related damages'.