There are many changes in the body after 14 days of quitting smoking. Smoking is not good for the health of the body, and after quitting smoking, firstly, it is good for freshening up the breath, and secondly, it is good for the function of the heart and lungs, and it also helps to sleep. 1. First of all, your breath will be fresher. Before you quit smoking, you will always smell like cigarette smoke when you talk to other people, and this feeling will gradually improve after you quit smoking. 2. You will feel smoother breathing, which is a sign of enhanced cardiopulmonary function after quitting smoking, long-term smoking has the greatest impact on the respiratory system. 3. 14 days after quitting smoking will also gradually feel the quality of sleep, smoking smoke nicotine will stimulate the sympathetic nerves, which makes the nerves excited, for those who like to smoke before going to bed, it is easy to lead to insomnia. After quitting smoking, some patients may experience withdrawal symptoms, such as nervousness and anxiety, etc. These are normal and will gradually improve, and should not be stopped as a result. If there is any discomfort, seek medical attention as soon as possible.