Comfortably deadly air while gambling

I went to my local pub recently to have my nightly beer.The place is smoke filled to the point of health hazard. Turns out V Slots has fitted air conditioners and air curtains to place. We used to have fresh air ventilating through place so smokers and non smokers could co exist, now V Slots has put air curtains at the doors that contain inner environment - this non ventilated area is the cooled by aircons or heated as required. Problem is - these aircons do not use clean out side air and pump it into place, they suck the stale smoke laden air inside place in back cool it and blow it out front. Same smoke laden air over and over and the more the people smoke inside the more laden the air become, but its just cooler - surely this contained super charged smoke air must be a health hazard compared to none. Remember there is little to no fresh - the air curtain see's to that - so every smoke lit just ups the air smoke ratio - but at least its at a nice temperature. Lastly this sealed air invoroment must surely be exstreme health risk to staff at 10 hrs a day shifts ?????