Smoking and wanting to stool may be due to the stimulating effect of tobacco on the stomach and intestines, after smoking can laxative, the nicotine contained in the smoke inhaled into the intestines will stimulate the contraction of the intestines, causing diarrhea, but less smoking or usually do not smoke, this will not happen under normal circumstances. Also consider that it may be caused by anal fissures or hemorrhoids, you can use drugs to treat hemorrhoids for relief, or it may be chronic colitis, gastritis or gastric ulcer, you need to go to the hospital to do a colonoscopy and gastroscopy. It is recommended that patients develop the habit of regular bowel movements, eat fresh fruits and vegetables rich in fiber every day, eat a light diet, avoid overly spicy foods, quit smoking and drinking, and pay attention to drink more water, exercise properly, rest more, and keep a happy mood.