Blood addiction
From the White Wolf Wiki, the most complete White Wolf reference
The drawback to consuming the Vitae of a Kindred is that the consumer risks blood addiction. Vitae is concentrated, stolen life force, and the heady rush of Vitae is as far above the rush provided even hard drugs like heroin as the heroin rush is above the addictive rush of tobacco. (VTR: Vampire: The Requiem Rulebook, p 158)
