In this April 30, 2014 photo, Bill Britt, who suffers from epileptic seizures and leg pain from a childhood case of polio, vaporizes medical marijuana at his home in Long Beach, Calif. Britt lives mostly on Social Security income and gets his supply for free from a friend whom he helps water and grow the plants. Insurers are reluctant to cover medical marijuana because of conflicting laws and lack of approval from the U.S. Food and Drug Administration. (AP Photo/Damian Dovarganes)
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