What are the chances of prolapsed cord or placental abruption?

Incidence of : Umbilical Cord Prolapse is 1.4 -6.2/ 1000 pregnancies. Frequency of placental abruption is 1% & abruption with fetal death, 0.12%. Risk of a 2nd abruption is 4-12%; of a 3rd, 25%. There's a 40% ^ in risk of abruption for each year a woman has smoked tobacco prior to pregnancy + a higher risk of fetal demise if abruption occurs in smokers. Cocaine use ^es risk up to 35%.