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What Parents Need to Know About Marijuana Use and Teens

Marijuana: Know the Facts

Marijuana Use and Educational Outcomes

Marijuana: The Brain's Response

Marijuana: Facts for Teens

Marijuana: Teens & Weed - Still a Big Deal

Marijuana: Facts Parents Need to Know

Marijuana: Facts for Families

Tips for Teens

Facts Parents Need to Know

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Does Marijuana hurt or help your brain?

As national attitudes and laws around cannabis use have evolved, so have the commercially grown strains of the plant. Some marijuana varieties today contain levels of THC, the drug’s psychoactive compound, as high as 50 percent, compared to around 5 percent a generation ago. But as science correspondent Miles O'Brien reports, the effects of cannabis on the human brain are still relatively unknown.