I put dates on my bottles out of curiosity of how much I vape. Back when I vaped one flavor all day every day (my beloved Peacemaker that is now discontinued ) I would go through 1 bottle every month, so roughly 1ml a day.
Now that I vape one flavor in the morning and various flavors throughout the day it isn't as easy to keep track of. I did go through 30 ml of my morning vape in roughly 3 months though. I am currently still tracking to see if those are consistent numbers or if they fluctuate. I too find it intriguing Rob. Although on a more personal level, as I'm interested in how much I vape.
With smoking it wasn't as interesting imo. You were either a PAD or 2 or 3. I do find it very interesting the differences between how much a person smoked and how much they now vape. Like a 2 PAD, full flavor smoker can be satisfied with 18mg blows my mind. Especially as I was a 1/2 PAD smoker and I wasn't satisfied until I started vaping 24mg. Or how some people can get all the way down to 4mg or 0 nic without even noticing. I tried vaping my old 18mg juices and it just wasn't enough. Maybe it's all psychological