quitting smoking

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Many medical health review and magazines, and even commercial ones, concede that the tar and carbon monoxide and other poisonous gasses emitted by cigarettes are the elements that harm the body, especially the lungs. Nevertheless, it is acknowledged that it is the nicotine that keeps the smoker hooked/addicted despite the adverse and deleterious effects of cigarettes. Does someone know whether the normal functions of the body would be restored to their pre-smoking conditions after a smoker has quit the habit?