Eco-Cigs Cartomizer Refills contains only water, propylene glycol, nicotine (in varying levels, from high to none), and flavoring. This mixture is known as e-liquid. When you inhale, the device is activated, as shown by the indicator light. The atomizer inside the cartomizer refill, powered by a small rechargeable lithium battery, turns the e-liquid in the cartridge into a smoke-like, odorless vapor mist.
Because there is no flame and no smoke, Eco-Cigs Electronic Cigarettes are legal to "smoke" virtually anywhere.