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Tobacco smoking is the primary cause of which cancer?

  • A Liver cancer
  • B Stomach cancer
  • C Lung cancer
  • D Bone cancer

Correct answer: C. Lung cancer

Explanation: Tobacco smoking is the leading cause of lung cancer, responsible for ~85% of cases. Tobacco smoke contains carcinogens (PAHs, nitrosamines, benzene). Smoking also causes cancers of mouth, throat, oesophagus, bladder, kidney, and pancreas.

Concept context

Pathogens, infectious diseases, non-infectious diseases, drugs, cancer, and public health. High NEET importance.

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