Brian Lawson rolls a marijuana cigarette at the BC Marijuana Party Headquarters in Vancouver, British Columbia. Vancouver is in the marijuana-friendly corner of Canada. Jae C. Hong/AP hide caption

itoggle caption Jae C. Hong/AP

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

itoggle caption Kelley McCall/AP