Smoking and breastfeeding?

Is smoking while breastfeeding a yes or no? I'm aware smoking during pregnancy is a huge no no and I've already quit not long after I found out about this baby. I couldn't quit cold turkey so I had to ween myself off of them. I know starting back afterwards would be stupid, but everyone I'm around smokes so I'm just curious, if after the baby is here and I do start back would it effect her breastfeeding? I plan on exclusively breastfeeding for a year. 

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