I barely vaped juice with a nicotine level, but I did smoke 3mg bottle of bavarian hazelnut since I gave it a shot.
Mostly 6mg but on occasion I will go up a bit, like when I do my menthol juices. I like those around 8
I mainly use 3mg. This is mainly down to the fact I use drippers and sub-tanks now but occasionally I'll put a 6mg liquid into one of my more "normal" tanks
3mg in a dripper, 6mg in a tank (on the rare occasion I use one). Came down from 24 in the beginning.
I am currently using 6mg and working my way down to 3mg. Then hopefully off of the nicotine and just enjoying 0mg of eJuice flavor and big clouds.
3mg, unless I'm on a plane, in which case it's 6 (or 12)! But then again, I like blowing big clouds and tend to vape all day at my desk, so anything more than 3 would not be good. Also, I don't think I was ever particularly addicted to the nicotine when I smoked.