In a coho study nonsmokers were found to have carcinoma lung. This indicates -
Ans. is 'b' i.e., Etiology for lung Ca is multifactorialo Smoking is not specific for lung cancer becausei) Not everyone who developed lung cancer has smoked --> Other etiological factors (other than smoking) are also involved in causation of lung cancer, i.e., etiology of lung Ca is multifactorial.Not everyone who smoke develops lung cancer.
Smoking does not cause lung cancer
Etiology for lung Ca is multifactorial
Smoking is the only cause of lung cancer
Passive smoking also increases lung cancer