How does state marijuana policy affect US youth? Medical marijuana laws, marijuana use and perceived harmfulness: 1991–2014

  • Katherine M. Keyes
  • , Melanie Wall
  • , Magdalena Cerdá
  • , John Schulenberg
  • , Patrick M. O'Malley
  • , Sandro Galea
  • , Tianshu Feng
  • , Deborah S. Hasin

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