My brother recently brought a portable sewing table and the cabinetted Singer sewing machine from my mother's home. It has been in storage for over 20 years and when we unloaded it from his pickup I could smell the stale smoke patina on the table and case. It's out in the garage and I'll take out a cleaning solution and go over every square inch of the table and case. I'll have to carefully clean the machine, but until that smoke stench is removed it's not going into the house (or into a vehicle - it was brought here for delivery to my daughter). Mom lit a cigarette first thing in the morning and kept one going all day long until she went to bed. Each of us escaped the house as soon as we could and I never spent the night there once I'd moved out. Not until she moved after a health crisis and finally being forced to quit cold turkey did I take my children to spend time and stay at her new house during visits to the region.

My father didn't smoke and was in the house with second-hand smoke for 19 years; it doesn't seem to have affected the intelligence of any of the children. That said, I see the line Exposure of mothers to nicotine and other components of cigarette smoke is recognized as a significant risk factor for behavioral disorders, - there is a behavior/mental health disorder in a sib that might serve to validate that statement.