A young man smokes a marijuana cigarette at a park where people gathered to mark the First Worldwide March for Regulated Marijuana in Montevideo, Uruguay, Saturday, May 3, 2014. Uruguay released its rules Friday afternoon for the legal marijuana market it is launching this year. In Uruguay, consumers must be licensed, and each purchase will be tracked to ensure they buy no more than 10 grams a week, said Mujica who along with his minister will sign the regulations on Monday, and they’ll take effect on Tuesday. (AP Photo/Matilde Campodonico)