i have quit 2 years ago, after 20 years of smoking!!! i am very satisfied i did it without any treatment or "medicals". i gave promise to my daughter, and didn't want to disappointed her! it was the reason big enough for me, honestly. i was repented about promise, but... my husband was very helpful, he stopped smoking at our home.
you can do that if you really want!
unfortunately, i put on 15 kg after that, and now i am fighting with fat