Letter from the Director What is marijuana? What is the scope of marijuana use in the United States? How does marijuana affect the brain? What are the acute effects of marijuana use? How does marijuana use affect physical health? How does marijuana use affect school, work, and social life? Can marijuana use during pregnancy harm the baby? Is marijuana use addictive? What treatments are available for marijuana abusers? Where can I get further scientific information about marijuana? Glossary References

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