According to what brand you smoke, but I'd say 24 to 18mg.

I'm an utter newb, and just started vaping three days ago... coming from ~two packs of Camel blue a day, and I'm using 12 mg strength at less than 2 ml per day so far -- which has actually been just fine, surprisingly. I've had no longing or desire for the old cigs at all. I have a full pack of my old habit in my coat pocket that I haven't touched, and I didn't even plan to be strict... I just figured, "let's see how it goes?" It turns out I just like the vaping a *lot* more and haven't had (or wanted) a single analog cigarette since I started. Early days, I know! But I'll stick with the 12 mg, and get some lower as well, and see... how low can I go.![]()
I actual moved up from 6 mg to 12-18 mg for more throat hit but I image I will move back down again lol!