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 multi factorial C Smoking is the only cause of lung cancer D Passive smoking also increase lung cancer 💡 Explanation In a coho study nonsmokers were found to have carcinoma lung. This indicates- ✓ Correct Answer: B. Etiology for lung Ca is multi factorial