D.A.
For me it would depend on how much they smoked and where they did it. I smoke just 1 cigarette a day (I know, it's a weird addiction to just have that 1....) - it's always at night and it's always outside on our porch.
I probably wouldn't judge any other parents who were real smokers as long as they didn't smoke in their house nor in the car (when any kids were inside of it).
I have a feeling that a lot of parents would have a problem w/ it though....but probably would be fine if it was happening no where near their kids.