I smoke, but i don't get cravings. When i need to calm my nerves i'll really want one but that's not often. I can go a whole week without smoking or quit cold turkey. I'm specifically looking for one of those detailed scientific explenations.
Im the exact same way. Can go through a few packs then stop for months with zero cravings. I dipped for a 6month period too and had zero problem quitting. Addiction is also rampant in my family on both sides.