One in five said they drove while "very high" at least once in the past six months, according to researchers from the University of Michigan Addiction Center.
Over half reported driving within two hours of taking the drug. She said it is even more important to understand the risks of driving under the influence of marijuana now that recreational, as well as medical, marijuana use has been approved in MI. They were recruited at three different medical cannabis certification centers in MI.
"Given there is no standard recommended "dose" for medical cannabis across conditions, further research is needed to better understand dosing of cannabis products", they added.
"Using marijuana can result in changes in your reaction time, how well coordinated you are, and we need those functions when we're driving to respond to unexpected events", said Bonar. The researchers asked about respondents' driving habits for the past six months. Researchers surveyed nearly 800 people from MI and asked about their history of driving within two hours of using cannabis in the past six months.
Bonar said mixing marijuana and driving is risky.
The study is especially timely because MI voters last November approved the use of recreational marijuana, and in December 2018 it became legal under state law for any MI resident over the age of 21 to use marijuana inside a private residence and to grow up to 12 plants for personal use.
Neurologist Dr. Orrin Devinsky of NYU Langone Health conducted the trials that led to the first FDA approved cannabis medication, a drug for epilepsy.