Social & Preventive Medicine In a coho study nonsmokers were found to have carcinoma lung. This indicates – A Smoking does not cause lung cancer B Etiology for lung Ca is multifactorial C Smoking is the only cause of lung cancer D Passive smoking also increases lung cancer 💡 Explanation In a coho study nonsmokers were found to have carcinoma lung. This indicates - ✓ Correct Answer: B. Etiology for lung Ca is multifactorial