<P> As of 8 August 2016, the FDA extended its regulatory power to include e-cigarettes . Under this ruling the FDA will evaluate certain issues, including ingredients, product features and health risks, as well their appeal to minors and non-users . The FDA rule also bans access to minors . A photo ID is required to buy e-cigarettes, and their sale in all - ages vending machines is not permitted . The FDA in September 2016 has sent warning letters for unlawful underage sales to online retailers and retailers of e-cigarettes . </P> <P> Effective 8 August 2016, all US states will follow the same, uniform federal guidelines . With an absence of federal regulations, many states and cities had adopted their own e-cigarette regulations, most commonly to prohibit sales to minors, including Maryland, Kentucky, Minnesota, New Jersey, New Hampshire, Tennessee, Utah, Wisconsin, and Colorado . Other states are considering similar legislation . Several US cities and states have enacted laws that increased the legal age to purchase e-cigarettes to age 21 . As of 2014, some states in the US permit e-cigarettes to be taxed as tobacco products, and some state and regional governments in the US had extended their indoor smoking bans to include e-cigarettes . </P> <P> Governor Arnold Schwarzenegger vetoed a bill that would regulate the sale of e-cigarettes within the state on grounds that "if adults want to purchase and consume these products with an understanding of the associated health risks, they should be able to do so ." </P> <P> A review of regulations in 40 U.S. states found that how a law defines e-cigarettes is critical, with some definitions allowing e-cigarettes to avoid smoke - free laws, taxation, and restrictions on sales and marketing . Less policies have been created to restrict vaping indoors than with cigarette smoking . </P>

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