I go through about 4-6 oz in a month with my RDAs, had to stop the 18mg, on 6mg now 
Hi, I vape almost 10 ml a day.. I guess I'm a chain vapor as well.. at least I'm not smoking anymore! I smoked almost 2 packs a day! I make my own juices and it really saves money.
I thought I was a chain vapor and had a problem.
I am glad to be in such good company and not feel like a freak of nature! I typically go through about 7 ml a day and I cannot vape at work.