John established a study to investigate the association between smoking and lung cancer. He assigned two groups; one is exposed to smoking and the other is not exposed to smoking. The two groups were followed over time to investigate the incidence of lung cancer. This study is:

Question

Quizplus · Accepted Answer

This study is a cohort study because it involves following two groups over time to observe the incidence of lung cancer based on their exposure to smoking.

John Established a Study to Investigate the Association Between Smoking