2001 Saturn L300 Smoke smell through vents at idle

Just had my heater core replaced, it was leaking coolant. Any chance that could be it? I'll check tomorrow for any possible fluids leaking onto the hot exhaust. Thanks so much.

Thanks for all your help thus far. After looking under the hood I can see that fluid is leaking from my heater hose connection straight down onto a pipe which is then steaming. I'm assuming that that might be the hot exhaust or if it isn't, then it's just a hot pipe that is still burning the fluid on contact and causing the smoke. GM says that my heater hose is good but the o-rings are bad. They're saying $300 to replace it, a local mechanic that I've gone to before says that he'll replace the hose for around $80. My question is, since I can see the heater hose connection, and I see that that is where the leak is, can I do it myself? Should I get the local shop to simply replace the hose? And what in the world is GM talking about?

Yes.