I'm in the process of quitting. My doc actually does a nicotine blood check so no room to cheat. I am using Chantix - luckily my insurance covers it 100%. Seems to actually be working - much to my surprise.
Next week will be the true test. One side effect is talking in my sleep which caused my husband to get mad one night because he thought I was awake and speaking to him and I have NO memory whatsoever. He's a good man and takes it in humor and won't let me do anything stupid.