Nowadays there is bad time for cafes, hotels and restaurants in our country. During the last six months of the year, their failure and bankruptcy increased to about 40%. It is considered that there are two reasons for this decline. Firstly, it is explained by a lack of purchasing power; and secondly, it is prohibition for smoking in public places. This prohibition for smoking in public places is not only reason for that decline. Certainly, a lot of cafes and bars are affected by the crisis mo...