I've been a "heavy smoker" for the past 37 years, but for the last 15 years or so, I've smoked "light 120" cigarettes. I thought that the juices in 12mg. would be enough nicotine for me. I like the flavors better than the analogs, but I don't seem to be getting my fix. I'm waiting for a few flavors to come in at 18mg. If this is not enough, I'll go to 24mg. I figured out that, that if the higher mgs. are too much that I can cut it with lower mg. flavors that I have and are compatible. It's better to feel good about yourself when you go from a higher mg. content to a lower one, than to feel defeated because you couldn't survive on a lower "dose".