When a smoker decides he wants to quit smoking he has to be mentally, as well as physically ready. Often a smoker who has smoked for any length of time will have withdrawal symptoms like the ones listed below:

These symptoms are what cause a person to start smoking again. They don’t feel “normal” and so they pick up a cigarette.
Smoking also affects how medications affect you. Once you quit smoking you will need to tell your doctor so that he can review all of your medications.