Can I Prohibit Smokers From Renting from Me?

[Account Closed]

Can I prohibit smokers from renting one of my apartments, or ask if they are smokers when screening tenants?

I'd figure this be in the "nuisance clause" being that it can be a health risk to myself and other tenants?

I am referencing this site, but not sure if it applies. I am in PA.
http://www.s-fhc.com/FairHousingAct.htm

[Matt R.]

"No one may take any of the following actions based on race, color, national origin, religion, sex, familial status or handicap:"

Tobacco use isn't a protected category
(Neither is poor dress sense, bad hygene, stupidity, or being a Republican 8^)