As for adding nic gum and using only 0mg nic liquid -- WTF?  Doctor must own stock in BigPharma cos.  Stupidest thing I ever heard .  (Not to mention, 
expensive.)  (Not to mention, adult ladies chewing gum is kind of, well, tacky.)
Nicotine stimulates ("tickles") the trigeminal nerve in the back of your 
throat; ergo, the higher the nic level, the bigger the TH. HOWEVER, most of the nic in 
e-liquid is absorbed bucally (via mouth tissue), and the vapor is best drawn slowly into your mouth, 
not directly into your lungs (yes, you have to re-train yourself on how to "inhale").
EDIT: Wader beat me to the punch, while I was busy being so wordy and opinionated!
