Brazilian artist Fernando de la Rocque blows marijuana smoke onto a stencil overlaying paper to create his art 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. A show featuring the work opened last week at a small alternative gallery in the stylish Ipanema neighborhood. 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)

Brazilian artist Fernando de la Rocque blows marijuana smoke onto a stencil overlaying paper to create his art 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. A show featuring the work opened last week at a small alternative gallery in the stylish Ipanema neighborhood. 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)