I smoked for most of over 50 years with the last 7 or 8 only being a pack to pack and a half a day, SO and I would share a pack so I was never sure just how much I would smoke, after deciding not to smoke in the house.Now that I've quit and he hasn't I know I was really smoking about 3/4 to one pad, since I was going by how long a carton would last. He would insist he was only smoking half a pad, but since the carton now only lasts twice as long I know better, he was smoking as much as I did. When I first started vaping I tried 18mg and it wasn't nearly enough, when I went to 24mg I was able to put the cigs down. Now I vape anywhere from 6 to 24mg throughout the day depending on whether I am feeling anxious or not. For me when I feel anxious it means I need to increase nic level rather than decrease, I have yet to get shaky from too much nic, rather I'll feel my heart rate increase a bit. Most of the day I vape 12 or 18 mg and when the cravings hit I up that to 24 for a little while until they go away. When I'm not feeling cravings and just want to vape I'll go with 6mg.