Technically yes you can. Since they are non-flammable and contain no tobacco, it’s really not smoking and use is not prohibited by law.
Many customers have used the product in restaurants, on airplanes, at work and in other places where traditional smoking is banned, and it will NOT set off smoke detectors either.
Still, don’t be surprised when people ask you about the device. Remember, to the casual observer, using an electric cigarette doesn’t really look any different than traditional smoking.
Many people report that simply explaining to others how the electronic cigarette works will usually create acceptance for them using the product anywhere.