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. In its entirety the candy bar is as strong at 30 marijuana joints. Colorado's marijuana experiment is under threat by the very popularity of eating it instead of smoking it, so the pot industry is joining health officials and state regulators in studying the problem of consumers eating too much too quickly. They plan to meet Wednesday, April 30, 2014, at Children's Hospital Colorado to discuss the potency and serving size of pot edibles. (AP Photo/Ed Andrieski, File)
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