The so-called "one day without defecation is equivalent to smoking three packs of cigarettes" actually means that metabolic wastes and toxins cannot be excreted in time, which will cause harm to the body. As for the harm, which is equivalent to several packs of cigarettes, it is difficult to say clearly. The intestinal tract is like the "sewer" of the human body. Once blocked, the stool will stay in the intestinal tract for a long time, which may cause acute or chronic constipation. It will lead to dull skin, acne, bad breath, etc. Some constipation may also cause hemorrhoids, anal prolapse, and even increase the incidence of tumors. In particular, constipation is a common trigger for acute myocardial infarction, stroke and other diseases in the case of basic diseases.