The relationship between smoking and tuberculosis, lung cancer, pancreatic cancer, and bladder cancer
The relationship between smoking and tuberculosis
According to the World Health Organization, infectious diseases such as cancer and tuberculosis remain major threats to humanity. Medical research shows that even after clinical cure of tuberculosis, the bacteria are not completely eradicated but remain dormant within calcified lesions. Like other pathogenic microorganisms, they gradually adapt to the human body's internal environment and develop drug resistance, leading to decreased drug efficacy. Under certain conditions, these pathogens can relapse and harm humans, and smoking provides favorable conditions for the recurrence of these infectious diseases. Furthermore, harmful gases in tobacco can shorten and cause the loss of respiratory cilia, impairing ciliary movement and weakening expectoration, thereby reducing respiratory resistance and opening the door for bacterial and other pathogenic microorganisms to invade.
Furthermore, smoking enhances the activity of enzymes in the liver, accelerating drug metabolism and reducing the body's absorption and utilization of drugs. Therefore, smoking affects the absorption of anti-tuberculosis drugs (such as rifampin), reducing their efficacy. In non-smokers, oral rifampin is rapidly absorbed, reaching peak blood concentration within two hours, while smokers show significantly lower concentrations. In addition, harmful substances in cigarette smoke hinder the healing of tuberculosis lesions, thus prolonging treatment time, increasing medication dosage, worsening dormant lesions, and extending the infectious period. Therefore, smoking is detrimental to healthy individuals and exacerbates the condition for tuberculosis patients. Thus, both active and passive smoking provide opportunities for tuberculosis bacteria to re-emerge. For your own health and the health of others, please do not smoke.
The relationship between smoking and lung cancer
In long-term smokers, the lung markings are significantly enhanced on X-rays. During lung surgery, opening the chest cavity reveals that the lungs have turned grayish-black. As early as the 1920s, the close relationship between smoking and lung cancer was noted; the proportion of smokers among lung cancer patients was significantly higher than that of non-smokers. The more one smokes, the earlier the age of onset of lung cancer; and the younger the age at which smoking begins, the greater the likelihood of developing lung cancer.
Many people may ask, why does smoking cause cancer? An experiment was conducted where tar was injected into the lungs of mice, and it did indeed cause lung cancer in some mice. Injecting tar into the subcutaneous tissue of mice also caused tumors in that tissue. Further research into the carcinogenic components of cigarette smoke revealed that the main carcinogen is a substance called 3,4-benzopyrene. This is a compound with potent carcinogenic effects. 2 milligrams of 3,4-benzopyrene can be extracted from 10,000 cigarettes, a dose sufficient to cause malignant tumors in experimental animals. Long-term smokers are more prone to lung cancer under the influence of these carcinogens.
Smoking can easily induce pancreatic cancer.
Modern medical research suggests that approximately 10% of pancreatic cancer cases are hereditary. For men with a family history of pancreatic cancer, smoking increases their risk. Furthermore, the risk of pancreatic cancer in smokers gradually increases with the number of close relatives (including parents and siblings) who develop the disease; for each first-degree relative diagnosed with pancreatic cancer, the risk increases by 40%. Therefore, smoking is an independent risk factor for familial pancreatic cancer, with smokers having a 4-5 times higher risk compared to non-smokers. In addition, smokers develop pancreatic cancer at a significantly earlier age than non-smokers. Quitting smoking can reduce this risk. In families with two or more members who have pancreatic cancer, quitting smoking can significantly reduce the risk of other family members developing the disease.
Currently, there are significantly more male smokers than female smokers in my country; therefore, emphasizing smoking cessation has greater practical significance for men.
Smoking can easily induce bladder cancer
When tobacco burns at temperatures exceeding 700°C, it produces a chemical called 2-naphthylamine, a substance that can cause bladder cancer. Smoking 40 cigarettes a day means inhaling 8.8 micrograms of 2-naphthylamine, a dose sufficient to double the risk of bladder cancer. Many factors contribute to bladder cancer, and smoking is a significant one.