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Story summary
- A JAMA study finds U.S. teens spend over 70 minutes daily on smartphones during school hours, mainly on social media and gaming apps.
- Lead researcher Dr. Jason Nagata of the University of California, San Francisco, says this smartphone use competes with learning.
- The study found that Black teenagers and those from lower-income homes use their phones more during school, among 640 teens aged 13 to 18.
