Which disease is primarily caused by smoking?

Question

BlackTom AI · Accepted Answer

Tobacco smoke contains numerous carcinogens (polycyclic aromatic hydrocarbons, nitrosamines, benzene) that directly damage the respiratory epithelium, so lung cancer is the disease most directly and primarily caused by smoking.

1. Relevant knowledge points and concepts
- Carcinogens in cigarette smoke cause DNA mutations in bronchial epithelial cells.
- Cumulative exposure (pack-years) increases mutation burden and cancer risk.
- Epidemiology: a very high proportion (estimated ~80–90%) of lung cancer cases are attributable to cigarette smoking.
- Other listed diseases (diabetes, hypertension, osteoporosis) have multifactorial etiologies where smoking is a risk factor but not the primary cause.

2. Step-by-step reasoning process
- Identify direct causal links: inhalation of smoke → deposition of carcinogens in airway mucosa → DNA adduct formation → mutations in oncogenes/tumor suppressors (e.g., KRAS, TP53) → malignant transformation → lung cancer.
- Compare causal strength: the relative risk of lung cancer for long-term smokers is substantially higher (often cited as 15–30×) than for never-smokers; such a strong, dose-dependent association with a biologically plausible mechanism supports primary causation.
- Evaluate alternatives: although smoking contributes to diabetes risk, causes transient BP increases and affects bone health, these diseases are mainly driven by other primary mechanisms (metabolic, vascular, hormonal/age-related respectively).

3. Intermediate steps / calculations
- While no numeric calculation is required, the concept of pack-years illustrates dose dependence: pack-years = (packs per day) × (years smoked). Higher pack-years correlate with exponentially higher lung cancer risk.

4. Why the correct answer is correct
- The combination of direct exposure of lung tissue to carcinogens, demonstrated mutagenesis, dose–response relationship, and overwhelming epidemiological attribution establishes lung cancer as primarily caused by smoking.

5. Why other options are incorrect
- Diabetes: primarily due to insulin resistance/β-cell dysfunction; smoking is a moderate risk factor but not the primary cause.
- Hypertension: primarily related to genetics, diet, obesity, and vascular factors; smoking contributes but is not the main cause.
- Osteoporosis: mainly due to aging, estrogen deficiency, calcium/vitamin D deficits; smoking accelerates bone loss but is not the principal cause.

6. Conclusion
Given the direct causal mechanisms, strong epidemiological evidence, and dose-response relationship, the correct answer is Lung cancer, which matches the provided answer.

Which disease is primarily caused by smoking?单项选择题

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