Question ID:PT10 S1 Q2 Passage:Switching to “low-yield” cigarettes, those that yield less nicotine, tar, and carbon monoxide than regular cigarettes when tested on a standard machine, does not, in general, reduce the incidence of heart attack. This result is surprising, since nicotine and carbon monoxide have been implicated as contributing to heart disease. Stem:Which one of the following, if true, most helps to resolve the apparent discrepancy? Correct Answer Choice:EChoice A:Smoking low-yield cigarettes has become fashionable, as relatively healthier styles of life have become more popular than those that have been identified as risky. Choice B:For those who are themselves smokers, inhaling the smoke of others is not generally a significant factor contributing to an increased risk of heart disease. Choice C:Nicotine does not contribute as much to heart disease as does carbon monoxide. Choice D:Carbon monoxide and cigarette tar are not addictive substances. Choice E:People who switch from high-yield to low-yield cigarettes often compensate by increasing the number and depth of puffs in order to maintain their accustomed nicotine levels.