Electronic Cigarette
Several companies are currently selling an electronic version of a cigarette.
The device takes the form of a tiny rod which is slightly longer than a normal cigarette. The mouthpiece of the device contains a replaceable cartridge of substance. The cartridge is filled with a liquid containing nicotine (amongst other substances).
When air flows through the device, it is detected by a microprocessor. This microprocessor then activates an atomizer which injects tiny droplets of substance into the flowing air. The microprocessor also activates an orange led to simulate real smoking.
The units use a rechargeable battery as a power source.