Brian Merchant says to "expect the sight of e-smokers puffing away on glowing e-sticks to become increasingly typical":
[T]heir market share is undoubtedly growing. They may be tacky and pose unknown health risks, or they might be the best thing that ever happened to smokers who can’t quit. Either way, the future of inhaling nicotine into your lungs increasingly belongs to smokeless delivery cartridges made in China.
(Chart from Euromonitor)