People who drive under the influence of marijuana double their risk of being in a car crash, and about one in 10 daily marijuana users becomes dependent on the drug, according to a new review.
Marijuana use has become increasingly prevalent over the years, and the review of marijuana studies summarizes what researchers have learned about the drug's effects on human health and general well-being over the past two decades.
In the review, author Wayne Hall, a professor and director of the Center for Youth Substance Abuse Research at the University of Queensland in Australia, examined scientific evidence on marijuana's health effects between 1993 and 2013.