The "smoke" that a user exhales is mostly water vapor and not hot, burning gases like a traditional cigarette. An electronic cigarette doesn't emit smoke on its own and there is no second hand smoke.

There is no lingering smell, and at most a bystander might detect the slight smell of the flavoring for a few seconds.

E-cigarettes will not leave a smoke smell, so it is safe to smoke indoors, in your car, without worrying that you will leave an odor in the fabric.