No one that I know that's tried it has succeeded. I hear that it does give you dry mouth and can cause nausea and dizziness. But that's about it. My mom, after smoking for years, finally gave up without any other help than the thought of a trip my dad promised her if they banked the money she spent on two packs of smokes per day instead. That was back in October and after smoking for 30 years, she's still not.