My wife and I both quit. She tried Chantix and ended up with a serious manic-depressive, "not-suicidal-but-I-could-kill-someone" issue. Her Doctor put her on all of the anti-psycho drugs to try to get her back on an even keel, saying "we're trying to give your body the same feeling as nicotine". She asked for how long? He said, "For as long as it takes. Could go long term." She asked if the pills were any less addictive than nicotine and he said: "No. They're about the same."
She suggested the electronic cig and he agreed. Smart girl, my Luscious.
So, she's still addicted to nicotine but got relief from the possibility of lung cancer.
Then, two years later, she was diagnosed with a brain tumor.
Ain't life a bitch!