New York City Mayor Michael Bloomberg, as one of his final act before leaving office, has signed the law banning the use of electronic cigarettes indoors in that city.

NYC’s “Smoke Free Air Act” now applies to e-cigarettes as well as tobacco cigarettes, which means their use is banned in restaurants and bars, offices and city-owned parks and land.

The signing didn’t come without a bit of theater; immediately after the mayor inked the law, two pro-smoking activists lit cigarettes inside City Hall to protest. One was Audrey Silk, the founder of the group “Citizens Lobbying Against Smoker Harassment,” known as CLASH. Both smokers had their cigarettes seized by security, and were ushered outdoors.

Many municipalities and states have passed ordinances or laws regulating the use of e-cigs. New York City, as the city with perhaps the most stringent anti-smoking laws in the United States, now has one of the strictest anti-vaping ordinances in the nation.

Not all anti-smoking groups are in favor of the city’s approach; Thomas Glynn of the American Cancer Society, says it’s misguided to “take something out of the hands of people which could, in fact, help (them) stop using the traditional…cigarette.”