Answer:
Cohort
Explanation:
Cohort studies refer to a form of medical study which is used to examine the reasons for the disease and to find its relation to the risk factors to medical outcomes. Usually, cohort studies track large groups of people, tracking their susceptibility to such risk variables in order to obtain answers to the potential causes of disease.
As per the question, researchers observe a group of people based on their smoking habits and tracked them for twenty years to observe its relation to lung cancer reflects the procedure of cohort studies.
The tag Igga kagabi hawk kaawn oaa
Generally speaking, economic policy must strike a balance between ideals and "pragmatism", since it is not always possible for a country or a state to make realistic economic goals that are beneficial to most of the population.