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Research Letter
April 2018

The April 20 Cannabis Celebration and Fatal Traffic Crashes in the United States

Author Affiliations
  • 1Department of Medicine, University of British Columbia, Vancouver, British Columbia, Canada
  • 2Centre for Clinical Epidemiology & Evaluation, Vancouver, British Columbia, Canada
  • 3Centre for Health Evaluation & Outcome Sciences (CHÉOS), Vancouver, British Columbia, Canada
  • 4Department of Medicine, University of Toronto, Toronto, Ontario, Canada
  • 5Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada
  • 6Division of General Internal Medicine, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
JAMA Intern Med. 2018;178(4):569-572. doi:10.1001/jamainternmed.2017.8298

On April 20 each year, thousands of Americans celebrate the intoxicating properties of marijuana on a popular counterculture holiday known as “4/20.” Legal marijuana sales surge in anticipation of the “High Holiday,” and college students report increased cannabis consumption on 4/20 itself.1,2 In many cities, activists and enthusiasts gather at public celebrations that feature synchronized mass consumption of cannabis at 4:20 pm.3

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