After reading how often tanks are being refilled, I'm thinking my drive for the real ciggies is because I'm not vaping enough. Although this week I am seeing improvement in that one pack of ciggies has lasted almost 3 days! My usual was 2 packs a day, half smoked or burned up. I did switch fro 7 mg nic to 12 mg nic, but really cannot stand the peppery taste. Going to try 3 drops of glycerin to 6 drops of the 12 and see how that goes. I figure equal glycerine and 12 mg would be about 6 mg nic, so that formula should be pretty close to 9 mg. Am a nurse, so might put my nurse cap on and do a real calculation.