A solid 4 ml a day. I have not got my pacing down yet with my vaping habits. I vape a VERY small amount in the A.M., and don't get back at it until late in the day. Mostly vaping in the evening after I get off of work is closely defined as chain vaping. Working on 24 mg as I kick the analogs to the curb. Had two today (a bit less than 3 weeks vaping) down from a pack and a half+ a day. I'm proud of that, and will fine tune as I go.