U.S. E-Cigarette Regulation: A 50-State Review. The Public Health Law Centre has published a chart that provides a snapshot of the U.S. landscape of e-cigarette regulation as of June 15, 2017. The information was based on a 50-state (plus Washington, D.C.) survey of current state statutes pertaining to e-cigarette regulations in the following areas: definition of “tobacco product,” taxation, product packaging, youth access/other retail restrictions, retail license/permit requirement, and smoke-free air legislation. In some instances, public domain websites have not yet been updated to include the most recently passed laws. The N/A designation refers to the lack of state laws or regulations related to e-cigarettes as of June 15, 2017; however, many local laws in these states (and throughout the U.S.) address e-cigarettes.