A new study finds teenagers who use marijuana and alcohol together are more likely to engage in unsafe driving, compared with those who use one of those substances alone.
“Simultaneous use makes a big difference in your risk for unsafe driving,” said lead researcher Yvonne Terry-McElrath of the University of Michigan’s Institute for Social Research. “There’s a very clear increase in risk for this group of kids, and for the rest of us on the roads.”
Teens who used alcohol alone were 40 percent more likely to admit they had gotten a traffic ticket and 24 percent more likely to admit involvement in a traffic crash, compared with teens who didn’t smoke marijuana or drink. Teens who smoked marijuana and drank were 90 percent more likely to get a ticket and 50 percent more likely to be in a car crash, compared with their peers who didn’t use either substance.