Where can I use electronic cigarettes?

Electronic cigarettes can be used in a lot of places that traditional tobacco cigarettes can’t be used. For example, in many states across the US smoking is banned in bars and restaurants. However, in almost all of them you can use an electronic cigarette. E-cigs can be used in places such as most office buildings and even some airplanes - tobacco cigarettes have been banned from these places for years. While E-cigs may not be allowed in every nook and cranny they are accepted almost everywhere.