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Albert Rizzo, chief medical officer of the American Medical Association, said that doctors have long known that smoking leads to inflammation in the lung but that that doesnt account for all the problems with the immune system

"This isn't a medication, it's safety has not been reviewed by the FDA, and they should [exercise] caution," Nieca Goldberg, a cardiologist at New York University Langone Medical Center, told Business Insider

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The statement cast doubt on the science linking smoking with ill health and pledged to smokers that it would create the now defunct Tobacco Industry Research Committee, hiring the best scientists to get to the truth