Assuming your body metabolizes the nicotine from vaping the same as burning tobacco, it'd be 1.2mg per cigarette. So, that should mean that 1ml of 24mg liquid = 1 pack of cigarettes. In my experience though, it doesn't. I had to go to 48mg to get myself off of cigarettes entirely. I then switched to 36mg for most usage and still do 48mg in the morning.
Nicotine in cigarettes is processed to help your body metabolize it quickly and efficiently. I don't think they're doing the same thing here with the eliquids -- with the possible exception of the NJOY King. That actually hits as quickly as a cigarette for me, but it's also high nicotine (45mg).
Basically, I'm of the mind that you should up the nicotine until it makes you prefer the ecig over the traditional cigarette. You can always adjust your dosage later, after you've kicked the psychological aspects of a burning cigarette. But tricking your mind into prefering vaping over burning tobacco is a huge thing. Going above your normal nicotine dosage helps that take place faster.
I've gone through 2ml of 48mg liquid easily in a day on certain days, and the worst I've felt for it is a little icky. TennDave vapes the equivelant of 1.5 cartons of cigarettes per day, so I think that says something about its bio-availability, considering he's not dead lol.
WOW Haha! I guess if he can vape 1.5 cartons a day I can try 36mg! I'll call Mt Baker first thing & see if I can change it before I place yet another order!