OT: Smoking ...Will a ban hurt of help the Industry

There is a growing debate regarding smoking in gaming establishments.  There
is merit to both sides of the argument.  In the long run,  will the clean
air attract more non-smokers who currently eschew casinos because of the
smoke infestation?  Will this amount be enough to offset the smokers who
will not return?  Are non-smokers more conservative(in general) in gambling.
Do smokers have a higher propensity for gambling and alcohol addiction?
With all things being equal,  based on demographic information,  is the
expected profit per smoker higher than the non-smoker?  I'm not interested
in discussion on why smoking should or should not be allowed,  but more to
the financial impact to the industry if it is banned vs maintaining the
status quo.