Comment Re:Understood (Score 1) 524
Fair enough, makes more sense now. Rereading it I believe I read your comment incorrectly.
I would argue that the vector in this case is other humans. I.e. oncoviruses use humans as their vector to spread.
So you can come into contact with people who might have cancer caused by a virus, and these people may infect you with the same virus that may then give you cancer. The end scenario being that you developed cancer by coming into contact with another human being.