Knowing that smoking attitudes are influenced by factors such as whether an individual's parents and peers smoke, the researchers also gathered data about the adolescents' social background.

为了了解选择吸烟的影响因素中是否包括父母和同龄人的吸烟状况，研究者也搜集了所调查的未成年人的社会背景资料。

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According to Xu, the smoking rate among young women, particularly white-collar workers, and adolescents has climbed in recent years.

据徐说，年轻女子尤其是白领的吸烟率逐年上升，并且近些年青少年抽烟率也逐渐攀升。

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Prevention and Intervention of Adolescents smoking behavior has become an important topic which is explored by current psychology.

青少年吸烟行为的预防和干预研究已成为当前心理学研究的热点问题。

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PG-13 films account for nearly two-thirds of the smoking scenes adolescents see on the big screen, according to the two-year study, which surveyed roughly 5, 000 children ages 10 to 14 about the movies they'd seen and whether they'd ever tried a cigarette.

CNN: Should smoking trigger an R rating?

About one-third to one-half of adolescents who begin smoking may do so because they see smoking in the movies, some research suggests, and the tobacco industry has spent big bucks in the past to make sure cigarettes appeared in popular movies, according to Smoke Free Movies, a University of California San Francisco project.

CNN: As movies portray fewer smokers, fewer teens light up

Kids under the age of 18 are particularly vulnerable to images of high-wattage stars smoking cigarettes on the big screen, partly because adolescents, similar to very young children, are prone to mimic behaviors they see others trying, Sargent says.

CNN: Should smoking trigger an R rating?