E Cigarettes - an alternative to your normal cigarettes.
Electronic cigarettes have absolutely no tobacco in them, therefore no tar or any of the thousands of other carcinogens found in your regular smokes and completely legal to smoke indoors and in public areas.
Electronic cigarettes are odour free, no more nasty tobacco smells. The exhaled smoke they emit is just vapour, completely harmless to anyone around you.
Still not convinced? Well not only do you get all the benifits of smoking ecigarettes listed above, best of all they are cheaper then standard cigarettes too!