It would take a lot of marijuana plants such as these to make four tons. Justin Sullivan/Getty Images hide caption
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marijuana
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A woman smoking marijuana at an Amsterdam cafe in February 2007. Christopher Furlong/Getty Images hide caption
Thursday
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Despite the "not for consumption warning," the DEA has banned the sale of products like K2, which contain herbs and spices sprayed with a synthetic compound chemically similar to THC, the psychoactive ingredient in marijuana. Kelley McCall/AP hide caption
Wednesday
Marijuana buds tumble out of a jar. David McNew/Getty Images hide caption
Tuesday
