December 30, 2010
Greg Bryan photo

Dried leaves are visible in containers of incense not intended for human consumption at Enhale Smoke Shop in Tucson, Ariz., on Dec. 14, 2010. Federal authorities are planning to ban some of the chemicals found in a legal substance that they say, when smoked, gives a high similar to marijuana’s but is potentially more dangerous.

 
 
 
 

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