After quitting smoking, a person will experience certain withdrawal reactions. The withdrawal reactions occur because the person is overly dependent on nicotine and tar, and a syndrome of neurohumoral endocrine dysregulation occurs with a one-time withdrawal. In the digestive system, there will be temporary disturbances in digestion and absorption, there will be bloating, abdominal pain, nausea, acid reflux, etc. There may even be a natural desire to eat, and there will be alternating reactions such as bloating and diarrhea, constipation, etc. For the circulatory system withdrawal reactions when quitting smoking will include symptoms of chest tightness, shortness of breath, palpitations, discomfort in the precordial area, and nervousness, all of which are withdrawal reactions to quitting smoking. For the nervous system there will be a certain amount of anxiety, nervousness, poor sleep, and lack of deep sleep, all of which belong to the withdrawal reaction when you first quit smoking.