This simulation is of smokers in an enclosed (indoor) bar or restaurant over a 2-hour period where there are designated smoking and nonsmoking rooms. The two rooms are well-mixed and connected by a doorway or open passage.

You may select the dimensions of each room (Length x Width x Height in feet), the overall rate of outdoor air exchange (h^-1), which is apportioned to each room according to their volumes, the air flow rate between zones (m³ h^-1), which is currently the same in each direction, and the total number of cigarettes smoked in the smoking room of the venue over the 2-hour period.

Multiple smokers can be active simultaneously. Each cigarette lasts 10 minutes. Cigarette starting times are assigned randomly. A given cigarette has an equal chance of being lit during any minute of the 2-hour period.