Quoting Kira Sutkay:" hahaha congrats my baby girl is almost here and i cant wait to toke up!!! its been forever ...my man ... [snip!] ... me... now can u breastfeed and still smoke or u gotta wait a lil bit cuz i know THC stays in your system longer than alcohol..."
You can smoke and breastfeed.
I smoked while breastfeeding my other daughter (well, not with her on the boob, but you know what I mean, lol) and she was just fine. I know lots of mamas who smoked while nursing.
Here's an article I found. *Disclaimer: there are lots of websites that will contradict this article, however, I find them to be biased and untrue. You're welcome to do some of your own research, I suggest Dr Melanie Dreher for a start. She's done some wonderful studies on marijuana and infant development.