More than four hours of daily smartphone use associated with health risks for adolescents

In a new study of more than 50,000 Korean adolescents, those who used a smartphone for more than four hours per day had higher rates of adverse mental health and substance use. Jin-Hwa Moon and Jong Ho Cha of Hanyang University Medical Center, Korea, and colleagues present these findings in the open-access journal PLOS ONE on December 6, 2023.