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BETHESDA, Md., March 2 () -- U.S. researchers said cannabinoids -- psychoactive compounds of marijuana -- can be detected in the blood of daily pot smokers during a month of abstinence.Dr. Marylin Huestis of the National Institutes of Health said the study involved 30 male daily marijuana smokers who temporarily lived in a secure research unit for up to 33 days. Their blood was collected daily. She said 27-of-30 participants were delta-9-tetrahydrocannabinol, or THC positive on admission. THC is the main psychoactive chemical in marijuana. The THC decreased gradually with only 1-of-11 participants negative at 26 days; while 2 of 5 remained THC-positive for 30 days,[url=http://www.govtvault.com/]cheap gucci belt[/url], Huestis said. "These data have never been obtained previously due to the cost and difficulty of studying chronic daily cannabis smoking over an extended period," Huestis said in a statement. "These data add critical information to the debate about the toxicity of chronic daily cannabis smoking." The findings were published online in Clinical Chemistry.