They do not. [ Ciri agrees without hesitation; that's quite easy for her to reveal, as she had already all but done so. ]

Though I have heard of vampires who are able to control their urge for blood.

[ Higher vampires are far different creatures of advanced intelligence than their common cousins. Ciri considers the man before her much more akin to a higher vampire than a regular one. Even if the reference isn't exact, it's a helpful measure. ]

I take it, then, the city of Cadens won't have to worry about a bloodsucker stealing away youths in the night? That's a relief.