Smoking bans are gaining widespread support in the United States and o
ther countries. While supporters argue that bans are necessary to reso
lve market failures associated with negative externalities, the Cease
Theorem predicts that, under various conditions, private markets inter
nalize negative externalities. We examine the smoking issue within the
framework of the Cease Theorem and hypothesize that smoking bans misa
llocate air space resources shared by smokers and nonsmokers. Because
smoking bans shift ownership of scarce resources, they are also hypoth
esized to transfer income from one party (smokers) to another party (n
onsmokers). Supporting evidence for these hypotheses is provided by an
examination of a comprehensive smoking ban imposed in San Luis Obispo
, CA.