You CAN begin to save money after finding the ideal setup and a few favorite flavors of
e-liquid.
The issue with many of us is this often becomes as much a hobby as well as a means to quit smoking.
After 1.5 years since I quit smoking, I've found the perfect battery setup (two Provari's), several fully capable backups, plenty of batteries for all, and two battery chargers. I've also got all the juice delivery attachments that I will ever need. (twelve pyrex cartotanks, several months worth of my favorite cartomizers, a few clearomizers with replacement heads, and two RBA tanks)
I have enough commercially made juice to last me at least a couple of months, and I have a large 500 ml bottle of un-flavored nicotine e-liquid and concentrated flavorings that I can make my own DIY liquids.
I could go several months or longer without spending ANY money on
vaping, which is a good thing because I am currently unexpectantly unemployed after losing my job after over 30 years of dedicated and loyal service.