| http://www.w3.org/ns/prov#value | - odes in the neck, and 547 individuals without these cancers seen in the Greater Boston area from December 1999 to December 2003.After factoring out the impact of smoking, drinking, and other factors that might influence the results, smoking marijuana from once every two weeks to three times every two weeks, on average, was associated with about half the risk of head and neck cancer, compared with
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