Exhibitors of e-cigarette and vapor products exhale as they demonstrate using their products to lure customers and visitors at the “Vape China Expo” at an exhibition center in Beijing, China, 23 July 2015. While health benefits of e-cigarettes and vapor products are largely still undetermined and up for argument from many sectors, the market for these products are reportedly growing around the world. (Photo by Rolex Dela Pena/EPA)
