That's a really good scenario CD. Great food for thought. But, here's another scenario from a more recent time(50s, 60s or even 70s), from my families point of view.
Mom, Dad, and a few friends are sitting around the table after dinner on a usual Saturday night or it could have been a Tuesday, ashtrays conveniently placed and a fresh beer in everyones' hand.... Naturally the men are talking fishing, cars and other manly things. The women are talking about the kids, the price of groceries, Aunt Lindas(name changed to protect the guilty) latest antics and Moms' new curtains. She points to a case sitting on a table by the window and proudly says she made them on her new Brother sewing machine she bought just last week.
Now fast forward 40 or 50 years, after all those Tuesday and Saturday and other nights, and all the miles of sewing mom did while a cigarette sat next to her in the ashtray, how much of the gunk is from something else?
Cari