States that have passed initiatives to legalize medical marijuana have also seen a decline in traffic fatalities, according to a new study out this week by the Institute for the Study of Labor.

Opponents of medical marijuana often focus on the social detriment to making America’s most valuable cash crop available to those approved by doctors, arguing that medical marijuana legalization makes it easier for teens to buy pot and that they’ll soon move to more dangerous drugs. They also suggest that legalization would increase the number of vehicle accidents – and that very argument was one of the main reasons why California voters did not approve full legalization in 2010.

But far from marijuana acting as a ‘gateway