Suppose you want to study whether environmental tobacco smoke (ETS) causes heart disease. ETS…

Suppose you want to study whether environmental tobacco
smoke (ETS) causes heart disease. ETS exposure occurs among both smokers and
nonsmokers who are around tobacco smoke. However, smokers take in much higher
levels of chemicals from cigarettes than the levels encountered by nonsmokers
exposed to ETS. In what population would you choose to study ETS? Who would be the
exposed and who would be the nonexposed? How would you measure exposure? What
would be your heart disease outcome, and how would you measure it? What study
design would you use?