TV news are full of cigarette ban news nowadays . They show how council officers checks the bars, restaurants etc. . According to that
1- Smoking area must be an open area both around and top . Funny but, you can't smoke under an umberella according to this.
2- The smoking area and non smoking area must be seperated by a wall, glass etc.
Funny inventions comes to find a way to smoke in tea shops . One of them is, smokers are given 2 hosepipes both have one end outside of the building and they put the cigarette to outside end of one of the hosepipes . So, one hosepipe to get the smoke in and other one is to give the smoke out