Righto, after my previous facetious comment I'm going to wade in, OP, I smoked & breast fed with both of my DCs - I smoked outside but did not go through the apparently acceptable full body detoxification process that it entails.
I went out for a fag, I came back in, I breast-fed my child.
This is what I did. I BF'd my daughter until she was nearly three, she does not appear to crave fags, she does however, have eczema , as do I, I was FF by a non-smoking mother.
I expect neither applause nor flaming - there have been many studies as to the effects of smoking whilst BFing & FFing - none conclusive.
Life's a tricky balancing act, ultimately it comes down to a case of - do as you will (as you will), listen to others as you please, accept the consequences of those choices.
Ain't none of us perfect & we don't have to seek validation or approval for our actions - we just have to live with them.