E-cigarettes were first developed in China and were introduced to the U.S. market in 2007. Many are similar enough in appearance to be mistaken for regular tobacco cigarettes. But one look inside and you'll see the main difference: This is a tobacco-free product. E-cigs are actually vaporizers; instead of burning tobacco, the mechanism heats up a liquid. The liquid turns into vapor, which is then inhaled, or "vaped." While some argue that vapor offers health advantages over traditional cigarette smoke, regulatory agencies and some health experts aren't so sure that's true. Before you consider taking up the e-cigarette habit, read on to get the facts. 
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