This research aims to grasp the actual conditions of the use of smoking room in hospitals, where patients can freely smoke, to maintain health environment for non-smoker. We selected three hospitals including a mental one and investigated behavior of users at the smoking rooms in them. The characteristics of inpatients in the mental hospital and the differences of behavior between the inpatients and outpatients in the other two hospitals were discussed. Finally, we examined the capacity and size of smoking rooms by using of the queuing theory to propose a proper number of seats in smoking room.
