How many ciggerates do you have to smoke to have a miscarriage?

iM REALLY NOT SURE THAT THERE IS ANY PROOF OF A NUMBER OF CIGARETTES SMOKED TO LEAD TO MISSCARRIAGE!ALTHOUGH IT HEIGHTENS THE RISK OF MISSCARRIAGE.....IT DOES NOT MEAN THAT IF YOU SMOKE YOU WILL MISSCARRY!I HAVE KNOWN PEOPLE TO SMOKE THROUGHOUT THEIR PREGNANCY AND THEIR BABIES WERE JUST FINE!ON THE OTHER HAND I KNOW PEOPLE THAT DONT SMOKE AND HAVE MISSCARRIED.iF YOU HAVE BEEN SMOKING IT DOESNT MEAN U WILL MISCAARY,BUT IT WOULD BE A GOOD IDEA TO THINK ABOUT QUITTING FOR YOU AND THE BABY!