These rooms appear to have ventillation systems but the smoke typically pollutes much of the surrounding vicinity
At the risk of sounding like a spokesperson for the smokers ( a thankless task and a very odd one for me as a non smoker and hater of cigarette smoke
) - there are badly designed rooms around, but others have a simple 'air lock' double door and adequate ventilation that even an asthmatic ASH supporting bulldog would fail to whiff from 3 metres. There is no excuse for 'leaky' smoking rooms and they should be banned and reconstructed.
Just converting a brrom cupboard will not do.