There are many smokers who believe that smoking can promote bowel movement and help defecation, but this is actually wrong. Because smoking does not help defecation, but can worsen constipation and even lead to anal diseases such as hemorrhoids or anal prolapse. If so, then why would anyone say that smoking helps with bowel movements? This is because research has found that the nicotine in tobacco has the effect of promoting intestinal peristalsis, but it is unrealistic to rely on it to achieve the effect of reducing constipation. Because nicotine’s regulation of nerves is first excitement and then inhibition, that is, smoking can make the peristaltic muscles of the gastrointestinal tract increased, so that they become excited, but its action time is very short, and will immediately go into a state of inhibition, thus reducing the peristaltic movement of the gastrointestinal tract, resulting in hemorrhoids or aggravate constipation. Therefore, smoking will not help with bowel movements. At the same time, the habit of smoking while going to the toilet, there will be some adverse effects: first, long squatting leads to or aggravate intestinal diseases: smoking while going to the toilet may grow the time to go to the toilet, and long squatting or prolonged defecation time, will lead to rectal venous stasis, which in the long run will lead to constipation or hemorrhoids. And when constipation occurs, forceful defecation may also cause anal fissures, anal prolapse and other diseases. Second, aggravate the damage to the respiratory system: smoking when going to the toilet, due to the small, confined environment, poor ventilation, will cause a significant decline in air quality in the toilet. Tobacco in the conditions of insufficient oxygen, insufficient combustion, will release more carbon monoxide, sulfur dioxide, coupled with the stimulation of tobacco smoke itself, the damage to the respiratory system will increase, and can even cause some sensitive people cough, chest tightness and other symptoms.