Smoking Problem
 

When i start driving and the car gets up the normal temp and i stop and i light my exhaust starts to smoke. its not a lot of smoke but its noticable. Can any one help me out here

it's chicago and its still winter there.

ohhh i have the same problem, when ever i start my car up it idels and it starts smoking, you cant really see it much but its smells soo raw, i dont know what it is.