As far as quitting smoking goes. My doctors do not believe my cancer came from smoking. The cancer started under a tooth down in my jaw bone. There were no outward signs and I had cancer nowhere else in my mouth. Now, this may be true or not true, I'm not sure. All I know is that I wasn't a heavey smoker but I did smoke. The day before my surgery was my last day of being a smoker. I didn't even think about smoking until I was home and felt alive approx. 2 weeks later. To this day I miss smoking as it was a comfort to me. My husband, who smoked more then I did, also quit cold turkey when I came home from the hospital. Our kids are thrilled about it. My best friend had to use Wellbutrin to quit, so I guess it depends on the person. I suspect that some will never be able to quit, even with the threat of it causing a return of the cancer. You have to have been a smoker to understand the incredible hold it has on you.