Researchers credit decline in smokers and growing smoke-free policies.
Read MoreDr. Martin Orens launches system for online medical record keeping.
Read MoreMexican papayas denied entry into U.S. unless proof is shown that the fruit is safe.
Read MoreCancer-fighting drug Zelboraf gains approval from the FDA.
Read MoreStudy by the CDC finds that rate of new HIV infections are 'stable,' but African-American men at greatest risk.
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