Franelic, Kuzman, et al 2011, found that marijuana intoxication increases automobile accidents.  Yacoubian 2007 study show similar findings.  It is important to mention that studies have also shown that marijuana offers analgesic effects for pain (Hogan, Gonzalez et al 2010).  Are motorists in Colorado and other states in the U.S. and abroad where marijuana is legal at greater risk of motor vehicle accidents as a result of increased marijuana availability?

Sources:

Impact of envirtonmental factors on marijuana use in 11 European countries.  By Iva Pejnovic Franelic (Croatian National Institute of Public Health),  Marina Kuzman (CNIPH), Irvana Pavic Simetin (CNIPH), and Josipa Kern (University of Zagreb).  Croatian Medical Journal, Aug 2011,Vol. 52, Issue 4, p446-457.

Assessing the Relationship between Marijuana Availability and Marijuana Use: A Legal and Sociological Comparison between the United States and the Netherlands.  By George Yacoubian (Prosecutor, Office of the District Attorney, Philadelphia, Pennsylvania).  Journal of Alcohol & Drug Education; Dec 2007, Vol 51, Issue 4, p17-34.

Pain-Related Anziety and Marijuana use Motives: A Pilot Test Among Active Marijuana-Using Young Adults, by Julianna Hogan (University of Vermont), Adam Gozalez (UV), Ashley Howell (UV), Marcel O. Bonn-Miller (Veterans Affairs Palo Alto, California), and Michael J. Zvolensky.  Cognitive Behavior Therapy 2010, Vol. 39, Issue 4, p283-292.


Conflicting  Study

The following academic article was brought to Juggling For A Cure’s attention.  The authors, Anderson, Hansen, and Rees (2013) found that marijuana and alcohol are substitutes, and they posit that marijuana leads to less traffic accidents due to drivers using it in lieu of alcohol, which was shown to be more impairing.


Source:

Medical Marijuana Laws, Traffic Fatalities, and Alcohol Consumption.  By D. Mark Anderson (Montana State University), Benjamin Hansen  (University of Oregon), and Daniel I. Rees (University of Colorado Denver).  Journal of Law and Economics. 2013.