Not all the E-Cigarettes are nicotine free. There is this thing called “e-liquid” which is basically a cartridge that goes right into the body of the Electronic Cigarettes. It could consist of nicotine, but there are some e-liquids that are nicotine-free, which means there will be no amount of nicotine present in it. Only the flavor of nicotine would be added so that while vaping, the user could feel the taste of nicotine but it`s actually harmless due to the no presence of actual nicotine.