My sister did what LT said, weaned the kid after 5 months and gave him the bottle. Partly because he wasn't good at breast feeding, partly because she smokes, like you do, and while she always wanted a kid, she decided her mental health was more important then breast feeding. I'm sure there are people that judge her for it, or would if they new, but I say **** them, happy parents, happy children, and if you need it, go ahead. She only does it at night when he is sleeping, btw, so there is minimal chance of it going wrong.