The respiratory system takes on the very first punch of tobacco poisons. The dense particles of soot and everything that tobacco smoke contains, irritate the mucous membrane of the larynx, trachea, bronchi, smallest bronchioles and pulmonary bubbles - the alveoli. As a result, exposure to tobacco poisons develops chronic inflammation of air passages. Smokers often suffer from bronchitis, and they are constantly tormented by a cough, especially growing in the morning.
A cough is accompanied by copious expectoration of dirty gray sputum. The constant irritation of the vocal cords, which is common among smokers, makes their voice rough, hoarse, and unpleasant. That, in turn, can become a barrier to professional activity (e.g. singers, teachers).
In one year, the lungs of a smoker take about 800 grams of tobacco tar. Therefore, smoker's lungs become darker than the lungs of a non-smoking person. Permanent, painful cough entails a reduction in the elasticity of the lung tissue, causing stretching of the alveoli and the development of lung emphysema. Scientists have shown that smokers’ lung functions are less full-bodied in every respect. Lungs’ resistance to infectious diseases becomes significantly reduced.
Doctors have established a direct link between smoking and tuberculosis. Smokers have tuberculosis twice as often as non-smokers. Smoking is one of the first causes of lung cancer. Statistics say that people who smoke have 10 times higher expectation to get lung cancer than non-smokers. Studies conducted in the US and Europe have shown that the risk of lung cancer increases directly in proportion to the number of cigarettes smoked. The expectation especially increases if smokers are accustomed to using half-smoked cigarettes and make deeper inhaling.
Pathologists’ researches have shown that smokers often have neoplasm of the bronchi, which are considered a pre-cancerous disease. And those who quit smoking have a significantly reduced risk of cancer. In several countries, scientists have studied the previous life of the lung cancer diseased, and have come to the conclusion that the majority of patients were tobacco smokers. Smoking can also cause cancer of the stomach, as a smoking person is constantly swallowing saliva, in which toxic products from the burned tobacco are dissolved. Scientists experimentally proved that tobacco contains carcinogenic compounds. Back in 1930, the Argentine doctor Roffo was greasing for 270-300 days the ears of rabbits with substances derived from tobacco tar, and then cancerous tumors started developing there.
Roffo’s experiments were repeated by other scientists with the same invariable results. In other experiments, researchers found that tobacco smoke contains a potent carcinogen - benzpyrene, which plays the first and primary role in the development of malignant tumors, it’s also considered fatal for humanity. In addition, smoke from cigarettes contains other dangerous substances which can also cause the development of cancer - chrysene, di benzantrene, di benzpyrene, and others.
Cigarette smoke also contains secondary amines which are soluble in the saliva and form nitrosamines in the stomach, which can cause cancer. Tobacco contains both natural and artificial radioactive elements. Finished goods (cigarettes, cigars) contain the radioactive isotope in a smaller amount than tobacco. This is explained by the fact that radioactive Polonium disintegrates during tobacco processing at factories and storage of finished goods in warehouses. A number of studies carried out to study the content of polonium in tobacco combustion products determined that the ash contains about 9% of the isotope, the cigarette butt - 20%, the filter - 8%, and the smoke - 50%.
As these figures show, half of the harmful substance is contained in cigarette smoke, so it is inhaled into the human body. From these data, we can conclude that stopping smoking tobacco would undoubtedly have reduced the incidence of such a serious and life-threatening disease like lung cancer.