3-4 ML a day, lately 20mg liquid and I still smoke 3 or 4 cigarettes a day--down from 1 to 1.5 ppd for forty+ years. I normally don't go more than 15 minutes a day without vaping, but most of the time it's maybe 2 or 3 long drags, not the equivalent of an entire cigarette. Probably the closest I come to chain-vaping in a smoking sort of way is when I'm driving.