No it is perfectly fine just be sure to wash ur hands after.
It does pass through the breast milk but my lactation consultant said the benefits of breastfeeding still worth it because through breast milk the baby gets all of your immunities and fights off germs and is less likely to get sick. But not smoking is best most definitely. And if you smoked while pregnant the baby is already addicted sadly.
From what I've read things like alcohol and nicotine and medicine etc all pass through breast milk.. do you'd probably want to either not smoke or formula feed. But I'd definitely do some research or ask your doctor. I was unable to breast feed my son six years ago so I'm just going off things I have read since then.
I was wondering the same thing bc I smoke cigs and im gonna breast feed when my baby gets here