Does anyone know if smoking cigarettes can cause a baby's heart to stop beating in the womb?

I have cut back DRASTICALLY. To like, 2 cigs max per day. But instead of stressing myself and my baby out, my doctor advised me to slowly stop. I go in for another sonogram next Friday which we then will also see the heartbeat but part of me is so scared there won't be one because I haven't stopped cold turkey. I'm currently 7 weeks. Please be kind, I know it's wrong. And I plan on being completely done with them by the time for my appointment.... 😔

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