It is possible that research linking caffeine to heart disease in heavy coffee drinkers may actually not be due to caffeine,but rather due to __________.

Question

Quizplus · Accepted Answer

Cigarette smoking is a known risk factor for heart disease and heavy coffee drinkers are more likely to be cigarette smokers. Therefore, the research linking caffeine to heart disease in heavy coffee drinkers may be due to their simultaneous cigarette smoking rather than caffeine consumption itself.

It Is Possible That Research Linking Caffeine to Heart Disease