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The MOST significant contributory factor to the development of lung cancer is ________.

  • A. being a cigarette smoker
  • B. belonging to the male sex
  • C. Being extremely obese
  • D. age over 4 0years
Correct Answer: A

Rationale: The most significant contributory factor to the development of lung cancer is being a cigarette smoker. Cigarette smoking is directly linked to approximately 85% of lung cancer cases. The harmful substances in tobacco smoke, such as carcinogens, damage the cells in the lungs, leading to the development of cancer over time. Smokers are at a significantly higher risk of developing lung cancer compared to non-smokers. Therefore, being a cigarette smoker is the primary and most influential risk factor for developing lung cancer.