Here is a good video of Clive Bates discussing why e-cigs won't work as a medicine. I'm not sure how to insert a video so here is the link (where is an eight year old when you need one?)
SWOF: Clive Bates on why electronic cigarettes won't work as medicines. - YouTube
SWOF: Clive Bates on why electronic cigarettes won't work as medicines. - YouTube