Does marijuana use affect driving a car?

The exact impact of marijuana on driving ability is a controversial subject—and it’s become more important states continue to loosen their drug laws. And, while drunk driving is on the decline in the U.S., driving after having smoked or otherwise consumer marijuana has become more common. read more

When marijuana use is combined with alcohol, the risk of having a highway mishap is significantly greater — much greater than with either drug used by itself. With the two combined their effect on driving skills are not added, they are multiplied, research shows. read more