I started smoking at twelve years old I'm 21 now. I have gone through months of heavy smoking and I will just put them down and quit, for months at a time. Even in times where I am a smoker i don't have cravings, and I don't need a cig. I usually don't know when to actually have a smoke( most people smoke when they get the cravings) I normally smoke alot because of this. I really have never been addicted to nicotine. My mother smoked when she was pregnant with me, maybe I'm immune to it? My question is is this common, are there people who don't get addicted? and why can't i get addicted? just curious thanks