A review of 25 years worth of car crash data has found a link between the so-called "high holiday" celebrated by marijuana users on April 20 (4/20) and a rise in fatal car accidents. The significance of the date is debated, but has been linked to the story of a group of students in San Rafael, Calif., who used to meet after school at 4:20 pm to smoke pot. The study conducted at the University of British Columbia looked at U.S. government statistics from 1992 - the year after an article in High Times magazine popularized the informal event - through 2016. Researchers compared fatalities on that date to those one week before and after it and found there to be a 12 percent increase on average, which represents 142 deaths. Fatal car crashes higher on 4/20 marijuana 'holiday'