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Researchers from Hanyang University Medical Center in South Korea found that teenagers who use smartphones for more than four hours a day exhibit higher rates of adverse mental health and substance use. Key findings: Researchers analyzed data from more than 50,000 Korean adolescents from the Korea Youth Risk Behavior Web-based Survey in 2017 and 2020, focusing on their daily smartphone usage. Why this matters: Previous research have linked increased smartphone use to psychiatric disorders, sleep disturbances, eye problems and musculoskeletal issues, the researchers noted.

The data included the approximate number of daily hours each participant spent on a smartphone as well as various health measures.

Participants who used a smartphone for more than four hours per day had higher rates of stress, thoughts of suicide and substance use compared to those with lesser usage.

A study in PLOS ONE involving over 50,000 Korean adolescents reveals that those using smartphones for more than 4 hours daily have higher rates of mental health issues and substance use, while moderate use may be beneficial.

Adolescents who indulge in smartphones for more than four hours daily could be at higher risk of adverse mental health and substance use risk, according to a study.Prior research has shown that smartphone use among adolescents has increased in ...