I experimented with higher nic levels at the beginning, 36mg 24mg and 18mg. The bottle of 36mg nic was way too high, what I experienced was a rapid heart beat, shaking and headaches. So don't know if too much nic is different from person to person, there is a
thread on here somewhere on spotting nic od (can't put up the link as I'm on my phone sorry).
I've now settled into 18mg or 12mg, I have a tendency to chain
vape at night so can still feel a bit jittery if I do this on 18mg. I was only 1 - 1 and a half pack a day smoker, but it seems nic level can be really personal and sometimes not reflective of previous smoking habit.
Good luck with it [emoji4]