What Are the Health Harms of Smoking?

What are the health harms of smoking? (1) Lung diseases. Cigarettes release over 4,000 chemical substances when burned, with harmful components mainly including tar, carbon monoxide, nicotine, and irritating smoke. Tar damages the mouth, throat, trachea, and lungs. In healthy individuals, the cilia lining the airways normally help expel foreign particles from lung tissue, sweeping them into phlegm and mucus for removal. The tar in tobacco smoke deposits on the cilia, impairing their function, leading to increased phlegm and chronic bronchial changes, resulting in bronchitis, emphysema, pulmonary heart disease, and lung cancer. Statistics show that 47% of smokers over 60 suffer from lung diseases, while only 4% of non-smokers over 60 do, which is a shocking figure.
 

What are the health harms of smoking? (2) Cardiovascular diseases. The carbon monoxide in cigarettes reduces the oxygen content in the blood, leading to related diseases such as hypertension. Smoking causes the coronary arteries to constrict, reducing or blocking blood flow, resulting in myocardial infarction. Smoking can increase adrenaline secretion, causing an increased heart rate and heavier heart load, affecting blood circulation, leading to hypertension, heart disease, and stroke.

Cigarettes contain nicotine, which, when inhaled, adversely affects the heart and blood vessels, causing sympathetic nerves to become abnormally excited, leading to vasoconstriction, forcing the heart to work faster, thus raising blood pressure. Some researchers have reported that smoking just one or two cigarettes can change blood pressure indices, so if one smokes dozens of packs a year, the cumulative effect over decades will undoubtedly have adverse impacts. The earlier one starts smoking, the greater the likelihood of developing diseases. Survey results show that those who learn to smoke in their teens are more likely to develop cancer than those who start in their twenties, and the incidence of arteriosclerosis and heart disease is also significantly higher. Additionally, the likelihood of developing diseases is closely related to smoking. According to a U.S. research report, the mortality rate from myocardial infarction and coronary arteriosclerosis is higher among smokers than non-smokers.

What are the health harms of smoking? (3) Smoking causes cancer. Smoking can lead to cancer; statistics show that smoking is related to oral cancer, nasal cancer, lung cancer, stomach cancer, intestinal cancer, bladder cancer, and breast cancer. Many may not know why smoking causes cancer; understanding the mechanism of smoking-induced cancer can greatly help people quit smoking early. Tobacco toxins dissolve in water and food, directly damaging DNA and causing gene mutations. Tobacco contains a significant amount of radioactive elements, which flow into the body with the smoke, damaging tissue cells. If one smokes 30 cigarettes a day, the toxins produced are equivalent to the dose accumulated from 100 X-ray exposures, which can cause gene mutations leading to cancer. Smoking also damages the immune function; this is why smokers are more prone to colds, as lymphocytes in the body act as guards to protect against harm, but smoking reduces lymphocyte activity, leading to cancer. Therefore, given the three major factors of smoking-induced cancer, quitting smoking as early as possible is advisable.

What are the health harms of smoking? (4) Smoking can also lead to osteoporosis and early onset of menopause. Smoking can cause men to lose sexual function and fertility. Pregnant women who smoke may experience premature birth and low birth weight, with an increased risk of miscarriage. Smoking causes teeth to yellow and can lead to bad breath. Smoking harms both the smoker and those exposed to secondhand smoke, with the dangers of secondhand smoke being twice that of active smoking, especially for children, who are more susceptible to pneumonia, bronchitis, severe asthma, and other diseases. If the current smoking situation continues, it will impose a significant cost on children's intellectual development, the families of smokers, and individuals themselves.

What are the health harms of smoking? (5) The impact of smoking on intelligence. Smoking affects attention; some believe that smoking can refresh and eliminate fatigue, triggering inspiration, but this is entirely unfounded. Experiments have shown that smoking severely impacts intelligence and memory, thus reducing work and learning efficiency. Psychologists have used the academic performance of 200 college students as experimental indicators, finding that smoking students scored an average of 7 points lower than non-smokers. Why does this happen? Because nicotine in cigarettes enters the body and stimulates the autonomic nervous system, causing blood vessel spasms, affecting the neural activity of the cerebral cortex, leading to diminished intelligence.

What are the health harms of smoking? (6) Smoking is harmful with no benefits. In China, 53% of children are exposed to secondhand smoke, which is twice as harmful as active smoking, and poses even greater risks to children, making them more susceptible to pneumonia, bronchitis, severe asthma, and other diseases. If the current smoking situation continues, it will impose a significant cost on children's intellectual development, the families of smokers, and individuals themselves.