Many people are able to quit cold turkey, in other words, overnight without any medication. Patients are asked whether they smoke, and they say no. They are then asked whether they used to smoke, and if so, how long ago they quit. These types of smokers tell us that they quit overnight, just like that, 25 years ago.
They do not see a doctor for help quitting. They just quit like that. Figures show that, over a lifetime, about 70% of smokers will quit.