I smoked analogs on purpose a couple of times the past few days so I could count how many drags I take off of one. I average between 12 and 15 inhales per cigerette.
I think you have to account for how many inhales you have too. A person who inhales only twice per cigarette won't get as much, a person who smokes a 100 will get more than somebody who smokes the same way who smoked kings, etc and since they count by drips (or at least inhales, sort've at least) I think you have to count that in too, some people suck on them like a sucker fish stuck to a fish tank, some people smoke them about the way most e cmokers smoke (long and slow but inhaling and having it out their nose sort of like a 'dragon snorting, which oddly I don't see hardly anyone doing with e cigs, msot seem to be going at this like they're pipes or cigars, unless absolutely everyone on YouTUbe etc is just not inhaling and 'dragon nostrilling' for effect to demonstrate how much vapor they get, I dont' know) some inhale more deeply, some more lightly, etc etc
In really thinking about all this, I don't see how even the exact same cigarette (say you have 10 people all smoking Marlboro red for example), because of the way they would all smoke differently, take different amounts of inhales, I don't see how that one cigarette could be counted on to deliver the same 22 mgs (or whatever) to all of them.