Can someone explain to me how is it possible to NOT get addicted and to NOT have any cravings? Me and my brother smoked one single cigarette when we were young, more than 10 years ago. Unfortulently my brother was made by his friends to smoke and he smokes one pack a day. However I seem to be fine, I NEVER had any cravings or felt the need to try another cigarette, even through I am near my smoking parents and my smoking workmates everyday. How come my brother started smoking and I haven’t been addicted after just one cigarette?