What is the smoke that is released from the E-Cigarette?

The simulated “smoke” is simply the water vapor and the cartridge contents of the nicotine cartridge being vaporized into what looks like a cool steam. This smoke is water vapor that evaporates into the air within seconds and leaves virtually no odor. There are no additional or unwanted chemicals produced in the vaporization process because there is no chemical reaction or combustion taking place as with regular cigarettes.

Since you are not burning the tobacco, things such as carbon monoxide and tar are a thing of the past!