Smoke from behind Back driver side tire

1997 Plymouth Breeze 107,863 miles. I noticed smoke from around the back driver side tire today when I got home. It also happened to my wife about two weeks earlier. Identical situations. We both drove the car about 5-6 miles(both ways) at about 55-60 mph on the highway. When we pulled in the garage at home and parked it is when you see alot of smoke. It comes from behind the tire and flows out above it. I checked all fluid levels and everything seems alright. There is not a drop of anything on the floor around the tire. It does have an oil leak and car kind of runs like poop. Its mostly a work car. Please Help!