I smoked for over 50 years. I tried many different methods to quit unsuccessfully. This time, it worked!! I developed leukoplakia of the vocal cords and lost my voice. The doctor told me it was caused by smoking. Using Chantx and electronic cigarettes I successfully quit. I place most of my success on the electronic cigarettes and not the Chantix. They satisfied the entire complex of behaviors that I had developed over 50 years. My doctor said to keep using them since he believes they are not harmful. As of today,my voice is back and the leukoplakia is gone!!! Thank you e-cigs.