Mello, how long have you been vaping, and when did you get to 6? I do have a 4 mg. juice, but I tend to non-stop vape it if I use it in the evening. I guess I just have to keep it in another room!
i started in march of this year (about 8 months ago)
i vaped 16-18 mg for 3 or 4 months, then dropped down to 12 due to the ill effects (jitters, sweating, ear ringing, sleeplessness and really jumpy to sudden noises).
there is a great chance that over-doing nic will effect people differently ( i hear many get nauseous but i never did).
the bummer about stepping down in nic level is that you get less throat hit....so i started adding 0 mg of peppermint into my lower nic juices. that way you get a "th-like sensation" even if there is very little nic in the juice.
you can not get a 0mg juice that has throat hit.
oh, and i dropped down to 6mg after 6-7 months and now im "dabbing" into 0mg liquids.
yes, i think i vape more with less nic but my thought is that eventually i will vape less. (i use roughly 4 ml's a day). like you, its difficult to put a firm number since i vape few different flavors.