Today’s pot is more potent, less therapeutic
Medicinal qualities may be up in smoke thanks to years of cross-breeding
![marijuana](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2015/03/ticker_Marijuana.jpg?fit=860%2C460&ssl=1)
Compared with marijuana grown 30 years ago, modern weed contains more THC, the chemical that gives pot its psychoactive effects, and less CBD, the compound thought to have therapeutic potential, a new analysis suggests.
U.S. Fish and Wildlife Service/Wikimedia Commons