Testing of electronic cigarettes, known as e-cigarettes, has shown that they contain cancer-causing chemicals and other toxins, including a compound used in antifreeze, U.S. health officials said Wednesday.

Nowadays, a battery-operated smoking device called E- cigarette is currently gaining popularity and is widely used around the world. However, certain government institutions in Canada, Australia and some US states.

Electronic cigarettes have been around for several years now. But it wasn't until recently that these devices started to draw interest from health officials and community leaders.