The rumor that Amazon has set its sights on disrupting the pharmaceutical industry has gained greater currency recently, just months after the company set the grocery business on fire with its acquisition of Whole Foods, and in the midst of its search for a second U.S. headquarters location. Amazon reportedly has taken major steps toward becoming a drug distributor and seller -- actions that have caused concern among potential competitors and may have figured heavily in CVS' negotiations to buy health insurance firm Aetna for $66 billion.