Smoking a cigarette while using the toilet is a method of relieving stress. However, it is not recommended to smoke in the toilet as it may increase the risk of respiratory diseases and cause constipation. Here are the reasons:

1. Increased Risk of Respiratory Diseases

The air in the toilet is generally poor, especially when it is not ventilated. The concentration of ammonia in the air is relatively high, while the oxygen content is relatively low. When smoking in such an environment, the tobacco burns in a low-oxygen state, producing more sulfur dioxide and carbon monoxide. If one smokes in the toilet, the toxic gases in the toilet are inhaled into the lungs along with the smoke, which is more harmful than smoking alone. Over time, this can not only lead to respiratory diseases but also increase the damage to the brain and nervous system. People with coronary heart disease or chronic bronchitis who smoke in the toilet may also experience acute attacks of angina, myocardial infarction, bronchitis, or asthma.

2. Caution Against Constipation

Many smokers feel that they cannot use the toilet without a cigarette and like to smoke while defecating. However, smoking during defecation can easily lead to constipation. Initially, nicotine may stimulate the intestines to move faster, but as the nicotine intake increases, the intestinal motility begins to slow down. If one becomes dependent on smoking to defecate, the intestines may become unresponsive or even stop functioning without the stimulation of nicotine, leading to constipation.

Therefore, smoking in the toilet is not a good practice and should be avoided. The belief that smoking can dispel bad odors in the toilet is merely self-deception.