Lots of people setting others up for failure with this 6mg if you vape a lot nonsense.
It all depends on your habits when you were smoking, and your body. Did you take your time and relax with a cig? Or did you choke down 2 in a 10 minute break? Half a pack/day or 1-2 PAD?
You need to take the time to learn the estimated value and what the veteran vapers recommend for your smoke habits. Dont assume the negatives are too much nicotine. It might be, but it is also just as likely to be NOT enough nicotine during the rough part of quitting.
Smoking a light cigarette for me personally is a 18-24 mg juice i would lean closer to 24mg to get that little buzz first thing in the morning, lol. Cutting down below 18 during your first 72 hours of quitting is just asking for trouble, but as DC2 said earlier, if you got this far... Keep it up =P