Low-dose pot-infused cookies, called the Rookie Cookie, sit on the packaging table Sept. 26 at The Growing Kitchen in Boulder, Colo. The state legalized recreational pot use last year. Brennan Linsley/AP hide caption
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Thursday
Wednesday
This human-scale lab rat cage is parked near a skate park in Denver, Colo., to make a point about the lack of science on marijuana. Richard Feldman Studio/Sukle Advertising and Design hide caption
Wednesday
Does smoking pot make it less likely that you'll go to college? iStockphoto hide caption
Tuesday
Edibles available at LoDo Wellness Center, a retail marijuana and medical marijuana dispensary and grow facility in downtown Denver. Matthew Staver/Landov hide caption
Tuesday
A smoker takes a puff at the annual Global Marijuana March in Copenhagen in May 2013. Gonzales Photo/Demotix/Corbis hide caption
Monday
Amber McGowan, left, and Krystal Klacsan work Monday at Cannabis City in Seattle, a day before the store is to begin legal pot sales on Tuesday. The store will be for now the only one in Seattle to sell recreational marijuana. Ted S. Warren/AP hide caption
Tuesday
The overwhelming majority of people think there should be age restrictions on the recreational use of marijuana. Ben Nelms/Reuters/Corbis hide caption
Sunday
People smoke marijuana, presumably, because it affects their brains, not despite that fact. Above, people in Sao Paulo, Brazil, campaign for the legalization of marijuana. Nelson Almeida/AFP/Getty Images hide caption
Thursday
Former Supreme Court Associate Justice John Paul Stevens likens making pot illegal to Prohibition. In his new book, Six Amendments, he proposes constitutional changes including a curb on an individual's right to bear arms. Chip Somodevilla/Getty Images hide caption
Sunday
With the Colorado state capitol in the background, Cannabis Cup attendees dance and smoke pot at the annual 4/20 marijuana festival in Denver. Brennan Linsley/AP hide caption
Sunday
A customer eyes marijuana samples at a Denver dispensary. The makers of a newly unveiled vending machine are hoping to change how pot is sold in stores. Theo Stroomer/Getty Images hide caption
Monday
Monday
Marijuana plants in Seattle. Ted S. Warren/AP hide caption
Monday
Marijuana is stored in bins for trimming and packaging in preparation to be sold retail at 3D Cannabis Center, in Denver. Brennan Linsley/AP hide caption
Tuesday
Marijuana plants in Seattle. Ted S. Warren/AP hide caption