"The point is we know that kids pay attention less and learn less with them in schools, so we can respond effectively to that whether we think they are addictive or not," Mr. Humphreys said in an email.
CDC: Half of all teens use smartphones at least 4 hours a day
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Mr. Humphreys said the latest SAMHSA survey adds to a decade of research showing a marked decline in binge drinking, cigarette smoking, criminal mischief and unprotected sex among teens in developed countries.
Underage drinking wanes as teens embrace more isolated addictions
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