2004 Suzuki Forenza felt like I hit something and white smo

I was driving on the highway at night doing about 70 which is normal for me when I felt like I must have hit something, I didn't see anything around and my car sort of took a second to get back to normal. It was driving fine and the temp gauge was normal no check engine light either, I figured I must have hit a poor critter going across the road. When I got home I noticed there was whiteish (maybe greyish, it was dark) smoke with a very faint smell to it coming out of the engine compartment. What could cause this? Of course the car is nearly paid off and I've had many silly mishaps with it. People running into me, kids down the street putting things across the road for people to hit.I can't believe its something else now.