KHOU has video of a man being taken off a Continental Houston bound plane from Portland on Tuesday. Continental flight 1118 returned to Portland shortly after departure because a man refused to obey the no smoking sign. Apparently he was not able to sit next to his friend on the flight so he light a electronic cigarette.
Here is a link to the video.
It is great to know that the passengers did the right thing by coming to the aid of the flight attendant. Of course TSA chimed in that it was not a security issue.