I quit 2 years ago and I never felt better. I know it sounds strange but I read a book and I it was easy to quit. I strongly encourage everyone to do so because they can but they dont know that.
I, too, quit smoking five years ago. I remember that I had almost a full pack of cigarettes. I did not throw it away immediately, I kept it just in case. It was only a month after I quit smoking that I threw away this pack of cigarettes. I have quit smoking many, many times. And only the last one was successful.