It's in your mind. I smoked 2 packs a day, I know physiological addiction quite well. This is what happens with any habit, friend. If you eat burgers daily, you'll crave them when you diet. If you jerk off daily, you'll crave it when you try to stop to increase your sexual energy. If you love being a couch potato, you'll crave that couch when you go for a hike. If you... You get the idea. Do yourself a favor and start smoking once a week. Your highs will be better, you won't be a zombie, and maybe once your mind is not as foggy you'll stop and think if what you're doing is worth the results.