Opium

"Contrary to general belief, there is no federal law against growing P. somniferum."—Martha Stewart Living

"Regarded as 'God's own medicine,' preparations of opium were as common in the Victorian medicine cabinet as aspirin is in ours. As late as 1915, pamphlets issued by the U.S. Department of Agriculture were still mentioning opium poppies as a good cash crop for northern farmers. Well into this century, Russian, Greek, and Arab immigrants in America have used poppy-head tea as a mild sedative and a remedy for headaches, muscle pain, cough, and diarrhea. During the Civil War, gardeners in the South were encouraged to plant opium for the war effort, in order to ensure a supply of painkillers for the Confederate Army."— Michael Pollan