Surgeon General Vivek Murthy has done more to politicize science and erode trust in public-health leaders than anyone other than Anthony Fauci. Dr. Murthy was at it again on Friday with a headline-grabbing report that recommends alcohol be distributed with cancer warnings. The report warns that, for some cancers, “evidence shows that this risk may start to increase around one or fewer drinks per day.” Note the operative word, may. The link between heavy drinking and throat and mouth cancer is well-established—but not for moderate consumption. Two weeks earlier the National Academies of Sciences, Engineering and Medicine released a congressionally...