Mmmmm, Bob, being a nursing mother I've researched this as much as I could (at first to justify continuing smoking, and then to educate myself and motivate myself to quit) and there have been some studies on breastmilk and smoking, but I think I've only seen one long-term study done to show how easily a child is addicted later in life. There are some real problems with all of the variables; the level of consumption, the exposure of the infant to second-hand smoke (whether in the air or on clothes), smoking in pregnancy, and the constantly changing nature of breastmilk. I know Le Leche League states that a consumption of 15 per day is fine, and this is based on not smoking AROUND your child. However, so many studies don't take into consideration whether or not the mother DOES smoke outside or not.
Anyway, you're aware of all this already, I'm sure, but I'm curious...am I allowed to post links to outside sites here?