I have some form of Vape device in my mouth 24/7...
I guess I do about 50 - 70 hits per hour....
I do about 4ml per day (some days more, depends on stress)... and I thought I might need to slow that down too!
I toot about three or four good puffs every 20 minutes or so. Again depending on what I am doing and how often my brain gets distracted from it.