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National Geographic: World's Most Dangerous Drug: Methamphetamine is one of the hardest drugs to quit. Its abuse is ravaging rural communities and cities alike. NGC correspondent Lisa Ling goes inside this global epidemic to find out what makes meth so addictive and destructive.

Watch the full National Geographic: World's Most Dangerous Drug movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.