An electronic cigarette (e-cig or e-cigarette), personal vaporizer (PV) or electronic nicotine delivery system (ENDS) is a battery-powered vaporizer which simulates tobacco smoking by producing an aerosol that resembles smoke. http://en.wikipedia.org/wiki/Electronic_cigarette
These e-cigarettes have been commercially available in some countries for a couple of years, the UK included.
Has any slang word already been coined for them? (e-smoke? e-fag? e-dugans?)