FILE - In this April 18, 2014 file photo, a caregiver points out the strength of an edible marijuana candy bar at a medical marijuana dispensary in Denver. Starting Oct. 1, Colorado is requiring that marijuana products have a bolder label highlighting the level of THC, the compound in marijuana that creates users high feeling. Although theres little research about the effects of more potent marijuana, state officials hope it will give consumers more information before buying. (AP Photo/Ed Andrieski, File)