Um, ever hear of e-cigs? You know, the really popular things you are starting to see everywhere now. They use nicotine and flavor in a solution of vegetable glycerine and propylene glycol. Nicotine on its own is not all that bad for you, about on par with caffeine. The stuff that makes tobacco deadly is by-products of combustion as well as some carcinogens which are increased by the curing process, such as nitrosamines.
That said, a vaporizer for loose leaf tobacco seems a bad idea to me as the vapor is likely to still contain things like nitrosamines (since most if not all loose leaf tobaccos are cured) which are not present in e-cig liquids.
