Neighbor Lottery

I keep meaning to post a summary about our apartment search.  We ended up taking a place outside of our desired area, but we're pretty happy with it.  I've always thought that as long as school works out for Little Geek Girl we would be content to stay here.  Part of the apartment satisfaction was due to our downstairs neighbors.  They have a baby that we would occasionally hear cry and a piano, but for the most part we didn't hear them that much and they claimed never to hear us.  And they don't smoke.  Which is important when you are the upstairs neighbor (at least for us).

Apparently they've moved out on us.  Fair enough.  However, we suspect the new neighbors will be students.  There are four different names on the nameplate.  What are our chances that none of them will be smokers?  It's not looking good, but we can always hope.  Because I really really really don't want to have to move again.