FDA has initiated a research plan to evaluate the potential risks associated with long-term use of e-cigarettes, outgoing agency head Scott Gottlieb told House appropriators during an appropriations subcommittee hearing Wednesday (April 3). The agency is especially concerned about evidence from animal studies that show vapor in e-cigarettes can cause changes to tissue in the airways that can cause cancer or be a precursor to cancer, Gottlieb said. The same day, FDA issued a warning notifying the public of reports...