As for quitting smoking, upstairs is right. Even without nicotine, there should still be some tar or something, which will not be good anyway. These smoking cessation products are useless, it's up to you. The average smoker is just used to that action, not how comfortable it is to smoke. As long as you insist on not smoking from the moment you decide, I think one week is almost enough, and I am afraid that others will feel embarrassed if you don't smoke, so I have never given up.