Why does smoking make you want to shit?

It is considered that nicotine stimulation causes increased gastrointestinal motility, resulting in a feeling of defecation. In addition, it may also be nicotine allergy and other factors. In addition to nicotine entering the lungs when smoking, some nicotine will enter the stomach with the esophagus, and nicotine is not digested and absorbed, it will stimulate the gastrointestinal mucosa, gastrointestinal motility will be greatly enhanced. To prevent it, you need to smoke as little as possible or not smoke.