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[单项选择]Smoking Can Increase Depressive Symptoms in Teens
While some teenagers may puff on cigarettes to “self-medicate”(自我治疗) against the blues,scientists at the University of Toronto and the University of Montreal have found that smoking may actually __51_ depressive symptoms in some teens.
“This observational study is one of the few to examine the perceived _52__ benefits of smoking among teens,” says lead researcher Michael Chaiton, a research associate at the Ontario Tobacco Research Unit of the University of Toronto. “_53__ cigarettes may appear to have self-medicating effects or to improve mood, in the long _54__ we found that teens who started to smoke reported higher depressive symptoms.”
As part of the study, some 662 high school teenagers completed up to 20 questionnaires about their use of cigarettes to _55___ mood. Secondary schools were selected to provide a mix of French and English participants, urban and rural schools, and schools _56__ in high, moderate and low socioeconom
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