Why is it that i can smoke a pack a day for months and months, and then just quit out of the blue?

Answer:
you dont have a addictive personality!

---

Maybe your body gets tierd of nicotine and you don't crave it then it wants it after a while

---

Obviously you are addicted because you keep going back to smoking otherwise you wouldn't be asking the question. The hot thing to do is quit and never start again. Remember what you inhale today will affect how well or if you can breathe in the future !

---