Welcome to the money pit!
I spent a good bit of money at first and then learned to do the research and listen to reviews and forum posts before buying. Since the eGo days of three and a half years ago I finally settled on a high end mod (Provari) about a year and a half ago and recently bought a Sigelei Zmax V3 for backup. I spent too much on juice for a while and then tried Dekang and Hangsen juices @ 50ml for $10.99 to $13.99 (and less for lower nic levels).
I spent over $50 a week for cigs by the carton for my wife and me. Now, I spend about $35 a month for juice and Protank heads. I've been charging and rotating the same 4 AW 18650 IMR batts for a couple of years. I'm saving money over my previous smoking habit costs by quite a bit.
ECF has saved me quite a bit just for the information I obtain.
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