Well, I drove my car from my sister's house to the auto shop. MOST fortunately, there was no smoke nor a bad burning rubber smell from my car while I drove it. I explained to the auto shop person what happened yesterday, about the smoke when I got off the freeway, my adding the oil, driving all the way through town today to the auto shop, and they said that they'd be able to look at it tomorrow. At first, the guy said that if the radiator was cracked, there would be a lot more smoke and smell while driving slowly through town, rather than driving quickly on the freeway, and since that's opposite of what happened, I would like to think that the radiator is not cracked. Again, the more I think about it (in my completely uneducated mind...car-wise), I think that it just might be a simple belt problem and not a huge need-to-get-a-new-engine problem.