Some pieces of art by the Brazilian artist Fernando de la Rocque are seen at his studio in Rio de Janeiro, Brazil, Monday Aug. 20, 2012. Some of Rocque's pot-stained prints are being sold for $2,500 each. It takes him a week to complete a single print blowing about five joints' worth of smoke onto a paper daily. (AP Photo/Felipe Dana)

Associated Press
Some pieces of art by the Brazilian artist Fernando de la Rocque are seen at his studio in Rio de Janeiro, Brazil, Monday Aug.  20, 2012. Some of Rocque's pot-stained prints are being sold for $2,500 each. It takes him a week to complete a single print blowing about five joints' worth of smoke onto a paper daily. (AP Photo/Felipe Dana)
Some pieces of art by the Brazilian artist Fernando de la Rocque are seen at his studio in Rio de Janeiro, Brazil, Monday Aug. 20, 2012. Some of Rocque's pot-stained prints are being sold for $2,500 each. It takes him a week to complete a single print blowing about five joints' worth of smoke onto a paper daily. (AP Photo/Felipe Dana)
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