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    Examining sports gambling's rise in popularity with teens

    03:44
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  • Hundreds step out to cut their hair for charity during 'The Great Cut'

    02:33
  • Dozens of casualties reported after attack on Russian concert hall

    02:23
  • Alabama woman pleads guilty to faking her own kidnapping

    01:53
  • MLB video game introduces female players for the first time

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  • DOJ announces antitrust lawsuit against Apple over smartphone monopoly allegations

    03:37
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  • Federal appeals court appears skeptical over Texas immigration enforcement law

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  • Federal Reserve decides not to raise interest rates

    02:33

Study links young adults' marijuana use and mental health illness

02:04

A decade-long study surveying millions of people has shown a connection between regular marijuana use and mental health illnesses in young adults. NBC's Dr. Akshay Syal reports.