Once in the mouth, cigarette smoke irritates the tongue, gums, pharynx, it adversely affects the tooth enamel, and it begins to crack. Very often the mouth of a smoker has an unpleasant smell. Cigarette smoke irritates the salivary glands, resulting in excessive salivation. Scientists have found that smoking is a direct path to cancer of the lips and tongue.
The World Health Organization’s study revealed that cancer of the oral cavity and esophagus are four times more common among smokers than non-smokers. The poisoning effect of tobacco smoke is associated with mechanical, thermal and chemical impact. Toxic substances from tobacco smoke get into the digestive organs in many ways. Poisons penetrate the digestive system through the central nervous system, with the saliva, as well as through the circulatory system.
Statistics show a direct link between smoking and peptic ulcer and duodenal ulcer. Deaths from these diseases occur 3-4 times more often among smokers than non-smokers. Tobacco smoke irritates the stomach lining and causes increased secretion of gastric juice with higher acidity. The constant irritation of the stomach can cause the development of chronic gastritis. Nicotine inhibits contraction (peristalsis) of the stomach and intestines. Doctors studying this phenomenon found that a smoked cigarette slows the reduction of the stomach, and sometimes stops it completely. Thus, smoking inhibits the motor action of intestinal function. This explains the smokers’ poor appetite and poor digestion.
Smoking also causes harm to the liver. Scientists have conducted experiments on rabbits and observed irreversible changes in the liver of these animals. Smokers often have enlargement of the liver, which stops if a person quits smoking. Smoking also has an effect on the pancreas. Smokers have twice the risk of cancer than that of non-smokers. If a non-smoker constantly stays in a smoke-filled room, he has a danger of chronic gastrointestinal disease.