The same goes for illicit drug use.

这有点类似于那些非法药物的作用。

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Illicit drug use in the United States, as in Britain, is very common and usually begins in adolescence.

在美国，就像在英国一样，药物的非法使用十分常见，而且往往开始于青春期。

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The patterns of illicit drug use showed significant variations by age within the 50-and-over population.

通过调查图表我们可以看出，50岁以上的人随着年龄段的不同，用药情况呈现出显著差异。

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In other cases, we relied on expert opinion, like in linking New Orleans' leading murder rate to its illicit drug trade.

FORBES: In Pictures: America's Illegal Drug Capitals

Although illicit drug use has been declining in the UK, long-term problem drug use and drug-related deaths are not decreasing, says the British Medical Association.

BBC: Doctors say UK drug policy should focus more on health

The U.S. has some 60 million smokers, 20 million alcoholics and alcohol abusers, and 21.2 million illicit drug users (over seven million of whom are addicts).

FORBES: Bill Bennett: Still a Drug Warrior After All These Years