smoking areas?
smoke can't read and doesn't know where it can and can't go - smoke spreads across whole areas, it doesn't stop or stay over one side.
it is better than nothing but it doesn't solve the problem of smoke filled rooms.
if it worked then the ban may never have happened.
I think if landlords weren't selfish and had installed air con years ago - and actually switched it on! - there may never have been an issue of banning... but they didn't.
the amount of pubs i have been in that switch it off - either to save money or for some because people drink more when its smokey - is ridiculous.