Eek...where there's smoke there's fire! Some cars are just full of surprises and it's often a reflection of overall neglect somewhere in its life. Hard to tell dodgy sellers from the ignorant. So many times I've had a seller adamant that their car is perfect, then quizzed them on certain noises and the response comes back "oh it's been like that since I've owned it" or "I didn't notice that". My logic is, if they weren't aware of that...then what else haven't they noticed?
My first clue in a car's overall condition is the interior. Interiors are the first to show wear when a car has been neglected. Also a reflection of the seller's personality - if they don't care about where they are sitting, there's a good chance the rest of the car gets the same treatment!