By James Dennin for Kapitall. The popularity of smoking electronic cigarettes—termed vaping by the already-initiated— has grown faster than anyone previously thought. For a product that didn't really exist four years ago, it has grown into a $4 billion industry, with many estimates suggesting that it could make up more than half of the global tobacco market within a decade. That rate of adoption has been so fast, it's beating regulators to the punch. Anti-smoking advocates went into a fury over an advertisement from the company Numark, a subsidary of Altria (MO). The term's tagline is "Let it Glow," which consumer advocacy groups say is a pretty clear appropriation of the lyric "Let it Go" from the enormously popular Disney (DIS) film Frozen. The major concern with e-cigarettes, aside from the fact that the health-claims might be unsubstantiated, is that the fun flavors make it easier to market them to children. Many municipalities have already moved to treat e-cigarettes the same as combustible ones, but they are still allowed to advertise on TV and radio, while traditional tobacco is not. We decided to build a list of the cigarette companies and how much of this nascent market they've been able to snatch up. Do you think they will benefit, or will regulations choke up the profits? Use the list below to begin your analysis. Click on the interactive chart to view data over time. 1. Reynolds American Inc. ( RAI, Earnings, Analysts, Financials): Through its subsidiaries, manufactures and sells cigarette and other tobacco products in the United States. Market cap at $32.37B, most recent closing price at $60.94. Reynolds' brand Vuse is only available in two states, Utah and Colorado, but it built a 55% market share there in a manner of weeks.