My cousin smoked (cigarettes at least, pot I'm not sure of, but I wouldn't be surprised) and drank for her first two pregnancies and quit completely by the time the third came around. She had a m/c in between and I think that (as well as a new and supportive partner) may have been the catalyst for giving up before this bub was conceived.

She isn't a *bad* parent, altho given that she was an alcoholic pretty much for the first 10 years with her first two kiddies I don't know how she could give it her best shot, but it does prove that you can turn it around and change. Her first two kids do not have any bad health affects, but she was still well aware that both drinking and smoking can have a detrimental affect on your unborn and born children. The message is surely out there.

I guess one of the things is if her partner was willing to stop with her she'd have more support to do so.