2001 Nissan Sentra Tons of Smoke from tale pipe

I recently went on a long trip from my home town of Colorado Springs to see my brother in Arkansas before I went on the trip however I went and had the car looked at and had the oil changed. When I got back from Arkansas I noticed two days after I had arrived back that my car was emitting white smoke from the tale pipe I went home and checked all of the fluids and made sure that their was coolant for the radiator as well. That very same night a drove down my drive way then noticed a huge wall of white smoke coming from the tale pipe and it had a very strong burning smell to it not of rubber or anyting, but smelled as though my car had just over heated so I went back home and now I'm not real sure on what the problem is I will not however drive it Intell I know it is safe to do so. Thanks Alot!