As an ex-smoker, you don't. I hated people trying to convince me to stop almost as much as anti-smoking commercials. The smoker has to want to quit, especially because quitting sucks and life without tobacco sucks almost as hard. I initially quit for an ex-gf, but it wasn't anything she said. I was outside having a smoke and she happened to be too close to a cloud and she started choking. The smell was fine, the fact that I had the energy of a race horse in bed was even better, but she couldn't be in a place where the smoke was poorly ventilated, or she'd start choking. It scared me to see her choking like that and I didn't want them anymore. I stamped out the cigarette and made the decision to pick up a box of the gum, and switched it out for regular mint gum when that ran out. I've been smoke free since then.