03 ford taurus wagon

i have a 03 taurus wagon that has thick white smoke coming from tail pipe with a sweet smell yet sometimes like rubber.it does it everytime i start the car but if i drive for about 30 and get the car to regular temp then it seems to be ok.also after car gets to regular temp i can let it sit for 10 15 minutes and it may or not produce the white smoke depending on the tempature.but it never reaches more than the halfway point.so its not over heating i dont not see leaking fluids and no smoke comes from under hood car doesnt backfire or misfire but it does feel a little hesitant sometimes due to a vaccum leak i was told from autozone