Which statement is an example of epidemiological evidence linking smoking to lung cancer?
1 )
Chemical analysis of tar from cigarettes shows that it contains carcinogens.
2 )
Dogs made to inhale the smoke from cigarettes develop lung tumours.
The incidence of lung cancer increases in a population as more cigarettes are smoked.
4 )
When tar from cigarettes is rubbed onto the skin of mice, the mice develop skin tumours.
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