NIDA for Teens: The Science Behind Drug Abuse
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Teacher's Guide

Marijuana

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Marijuana is the dried leaves and flowers of Cannabis Sativa. Delta-9-tetrahydrocannabinol (THC) is the main active ingredient in marijuana that causes people who use it to experience a calm euphoria. Marijuana changes brain messages that affect sensory perception and coordination. This can cause users to see, hear, and feel stimuli differently and to exhibit slower reflexes.