Researchers have found that people who drink five or more cups of coffee a day have a risk of heart disease 2. 5 times the average after corrections are made for age and smoking habits. Members of the research team say that, on the basis of their findings, they now limit their own daily coffee intake to two cups. Which one of the following, if true, indicates that the researchers' precaution might NOT have the result of decreasing their risk of heart disease? ['The study found that for people who drank three or more cups of coffee daily, the additional risk of heart disease increased with each extra daily cup.', 'The study did not collect information that would show whether variations in level of coffee consumption are directly related to variations in level of stress, a major causal factor in heart disease.', 'Subsequent studies have shown that heavy coffee consumption tends to cause an elevated blood-cholesterol level, an immediate indicator of increased risk of heart disease.', 'Per capita coffee consumption has been declining over the past 20 years because of the increasing popularity of soft drinks and also because of health worries.']