My comments were to address the single parent household mostly. I've personally witnessed over the years dozens and dozens of children who are not fed a proper diet by mothers/fathers who have custody of a child after a divorce. I am of the opinion that this issue is more important than the smoking issue, which I, like you, believe should not be an issue when determing custody.
Thank you for your kind words.
I know exactly what you are talking about in regard to the diets of so many children. And not just in single parent households. I can think of quite a few 2 parent households with a SAHM that rely on the frozen food aisle at the supermarket for 5 or 6 out of 7 nights worth of dinners. That happens, maybe, once a month in my house, just for a treat.