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When it comes to a guide for your gut, count on YacL.

This is Scientific Americans' 60-second science.

I'm Steve Merski.

Tomorrow is April 20th, 420. It's sometimes called a high holiday, because for a lot of people, 420 is Marijuana Day.

And for them, it's kind of a tradition to start lighting up at 4.20 p.m. on 420, which led a couple of researchers in Canada to wonder if

there was any evidence for an increase in traffic deaths related to the occasion. They got access to

the United States National Traffic Safety Administration's Fatality Analysis Reporting System, which

tracks all public road accidents in which at least one person died.

And they looked at the numbers on 4.20 from 4.20 p.m. through midnight, from 1992 through

2016. They also examined traffic deaths related to accidents on the day one week earlier and the day one

week later during

the same hours. The result, a 12% increase in fatalities related to traffic accidents on 420 after

420 p.m. compared with the control dates. And for drivers 20 and under, the figure is much higher,

more than a 30% increase in some states.

The researchers in the journal JAMA Internal Medicine.

Of course, this study does not prove that impaired driving caused by marijuana consumption was the cause of the higher death rate.

For example, could be the drivers crash while simply trying to light up.

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