Although more American teens are using marijuana, their use of alcohol and cigarettes has decreased, a new study finds.

Penn State researchers reviewed information from nearly 600,000 high school seniors surveyed about their substance use between 1976 and 2013.

The results showed an increase in marijuana use, particularly among black teens. The study also found a significant decline in cigarette use, particularly among white teens.

Read more atĀ www.healthday.com