Up the Shenandoah Valley on the interstate, I pass New Market and think not of the men who fought in the famous 1864 Civil War battle but of the women who grew poppies for the benefit of wounded soldiers, harvesting morphine from the dried juice inside the seed pods. Three decades later, the German elixir peddlers at Bayer Laboratories would stock America’s drugstores with a brand-new version of that same molecule, a pill marketed as both a cough remedy and a cure for the nation’s soaring morphine epidemic, known as “morphinism,” or soldier’s disease. Its label looked like an amusement
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