The amount of nicotine you absorb is exclusive to you. I absorb it differently than you, you absorb it differently than the next person. There's no way to know how much you are getting.
I recommend the following: VAPE EARLY AND VAPE OFTEN!
Don't do it like you smoked. When I smoked I would wait until I had a nic fit and then try to hold off as long as I could before smoking -- mostly just to save cigs and save money. You can't do that with e-cigs. You have to vape BEFORE you start wanting a smoke - vape just for the sake of
vaping. Chain vape. Vape after you think you don't want a smoke anymore. Vape in the bathroom, vape at a restaurant, vape at the library, vape in bed. vape, vape, vape.....
Try to overdo it. If you still want a cigarette, vape while you think about smoking and if the feeling doesn't pass on its own have a smoke! Pretty soon the feeling WILL pass on its own and you'll be able to satisfy yourself just
vaping and not smoking.
After that, the honey moon feeling wears off and you'll start vaping on a more regular schedule. You won't chain vape forever - but for now, do it.