Single-use cups are piled up at a cafe in Seoul (Yonhap)_ Concerns are growing over the excessive consumption of caffeine among adolescents, according to a report on Sunday, citing a teen health study.According to last year's 'Youth Health Behavior Survey' conducted by the Korea Disease Control and Prevention Agency on some 60,000 middle and high school students in 800 schools nationwide, 22.3 percent of the respondents answered 'yes' when asked if they drink high-caffeine beverages more than three times a week.

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