Electronic cigarettes, or "e-cigs," are a new alternative to traditional smoking. E-cigs popped up in the U.S. around 2007, and the Wall Street Journal now reports that in 2013, the e-cig industry was on track to make nearly $2 billion in sales, almost tripling its 2012 figures. Damn. This electronic method works by heating up nicotine "juice" and converting it into vapor. Proponents of e-cigs argue that the practice is healthier than traditional cigarettes because users are only inhaling water vapor and nicotine. Because e-cigs are new, they're still relatively a mystery. Here is Everything You Need To Know About E-Cigarettes, as it continues to push its way into the mainstream.