Perhaps most important, they used to be exceptionally heavy smokers.

而最重要的是，通常他们烟抽的更凶。

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Pierce also shows that there are fewer heavy smokers in each new generation.

皮尔斯的研究结果同时显示，在每一代人中，烟瘾大的人数都在减少。

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In one experiment, he measured whether heavy smokers could watch a film that romanticizes the habit without taking a puff.

他做过一项实验：让那些烟瘾很大的人去看一部美化吸烟的电影，看他们是否可以不点上烟。

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Researchers examined data from previous studies to develop a genetic risk score for heavy smokers.

FORBES: Genetic Factors Linked to Smoking Addiction in Teens

Those who did try cigarettes and had a high-risk gene score were more likely to become heavy smokers.

FORBES: Genetic Factors Linked to Smoking Addiction in Teens

Schizophrenics, it has recently been found, are likely to be heavy smokers because nicotine is good for their condition.

ECONOMIST: Drugs to make you cleverer are in the test-tube. Good