References http://www.healio.com/hematology-oncology/news/print/hemonc-today/%7B241d62a7-fe6e-4c5b-9fed-a33cc6e4bd7c%7D/cigarettes-were-once-physician-tested-approved http://content.time.com/time/photogallery/0,29307,1848212,00.html
