Another sign of that era was that if you didnt have enough for a pack of fancy cigarettes, you could buy them in a crumble, one at a time
SHS effects on children may include: allergies, olfactory diseases (nasal), circulatory problems, asthma, respiratory problems, behavioral problems, Crohns disease, sudden infant death syndrome (SIDS) An estimated 35,000-62,000 deaths occur annually from heart disease in people who are not current smokers, but who are exposed to environmental tobacco smoke
The airflow (liters per minute or mililiters per second) can be obtained by dividing puff volume by puff duration time
Khaled SM, Bulloch AG, Williams JV, Hill JC, Lavorato DH and Patten SB, 2012
So, for each wall, you may do this in 2 sections (the top half and the bottom half)