Cannabis is the most frequently used illicit substance in the United States. Find out about the history of marijuana use, the chemistry behind a "high", and the possible dangers and benefits of cannabis. ➡ Subscribe: http://bit.ly/NatGeoSubscribe #NationalGeographic #Weed #Cannabis About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta Cannabis 101 | National Geographic https://youtu.be/QKqNRySpFCA National Geographic https://www.youtube.com/natgeo