The day after marijuana became legal in Canada, there is a new study out in the U.S. on legal pot and traffic collisions.
It comes from the Insurance Institute for Highway Safety and found that in states that have legalized marijuana, the frequency of insurance claims rose six percent higher than in nearby states where it's illegal.
IISH President, David Harkey, admits that the results only show a correlation and that more research is needed to determine whether marijuana may have caused the increase.
He also says more study is needed on the effects of different marijuana products on different people.
The study also found that marijuana-impaired drivers were more likely to have children in the car and to be driving during the day, than those impaired by alcohol.
It looked at insurance claims in Colorado, Nevada, Oregon, and Washington; states where recreational marijuana is legal.
It also looked at Idaho, Montana, Utah, and Wyoming where it is still illegal.