Remember Franco Columbu's genetic background (Sicilian, right?) makes him prone to lactose intolerance. If most of your genes come from farther north in Europe, you probably won't have a problem with milk.
Lactose intolerance is mainly a problem for people of Mediterranean, African, or American Indian background.
I'm part Indian, but I think the fact that I'm half-German makes me okay with milk. I drink about a gallon of fat free ED.