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  3. Ten years ago, in settling the largest civil lawsuit in the US history, the tobacco industry agreed to pay the 50 states $246 bi

Ten years ago, in settling the largest civil lawsuit in the US history, the tobacco industry agreed to pay the 50 states $246 bi

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问题     Ten years ago, in settling the largest civil lawsuit in the US history, the tobacco industry agreed to pay the 50 states $246 billion, to be used in part to finance efforts to prevent smoking. The percentage of American adults who smoke has fallen since then to just over 20 percent from nearly 30 percent, but smoking is still the No. 1 preventable cause of death in the United States, and smoking-related health care costs more than $167 billion a year.
    To reduce this cost, the incoming Obama administration should abandon one anti-smoking strategy that is not working.
    A key component of the Food and Drug Administration’s approach to smoking prevention is to warn about health dangers: Smoking causes fatal lung cancer; smoking causes emphasema; smoking while pregnant cause birth defects.
    Compared with warnings issued by other nations, these statements are low-key. From Canada to Thailand, Australia to Brazil, warnings on cigarette packs include vivid images of lung tumors, limbs turned gangrenous by peripheral vascular disease and open sores and deteriorating teeth caused by mouth and throat cancers. In October, Britain became the first European country to require similar gruesome images on packaging.
    But such warnings do not work. Worldwide, people continue to inhale 5. 7 trillion cigarettes annually—a figure that does not even take into account duty-free or black-market cigarettes. According to World Bank projections, the number of smokers is expected to reach 1. 6 billion by 2025, from the current 1. 3 billion.
    A brain-imaging experiment I conducted in 2006 explains why anti-smoking scare tactics have been so futile. I examined people’s brain activity as they reacted to cigarette warning labels by using functional magnetic resonance imaging, a scanning technique that can show how much oxygen and glucose a particular area of the brain uses while it works, allowing us to observe which specific regions are active at any given time.
    We tested 32 people(from Britain, China, Germany, Japan and the United States), some of whom were social smokers and some of whom were two-pack-a-day addicts. Most of these subjects reported that cigarette warning labels reduced their craving for a cigarette, but their brains told us a different story.
    Each subject lay in the scanner for about an hour while we projected on a small screen a series of cigarette package labels from various countries—including statements like "smoking kills" and "smoking cause fatal lung cancers". We found that the warnings prompted no blood flow to the amygdale, the part of the brain that registers alarm, or to the part of the cortex that would be involved in any effort to register disapproval.
    To the contrary, the warning labels backfired: They stimulated the nucleus accumbens, sometimes called the "craving spot", which lights up on functional magnetic resonance imaging whenever a person craves something, whether it is alcohol, drugs, tobacco or gambling.
    Further investigation is needed, but our study has already revealed an unintended consequence of anti-smoking health warning. They appear to work mainly as a marketing tool to keep smokers smoking.
    Barack Obama has said he has been using nicotine gum to fight his own cigarette habit. His new administration can help other smokers quit, too, by eliminating the government scare tactics that only increase people’s craving.
The author conducted an experiment to find that______.
选项 A、cigarette warning labels reduce smokers’ craving for cigarettes
B、anti-smoking warnings produce an unintended consequence
C、people are hooked on smoking once they fall into the habit
D、some social smokers will turn into two-pack-a-day addicts over time
答案B
解析
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