ABOUT DRUGS AND YOUR BODY You receive a lot of mixed messages. Marijuana Download the facts : www.teens.drugabuse.gov SCHOLASTIC and associated logos are trademarks and/or registered trademarks of Scholastic Inc. All rights reserved. Photos, composite image: © iStockphoto. Addiction: About 1 in 6 people who start smoking marijuana in their teens will become addicted. Accidents: Smoking marijuana messes with the skills you need to drive safely, especially when combined with alcohol. Failure in School: Smoking marijuana interferes with learning and memory, increasing the risk of poor grades and dropping out of school.