Right after I received my Cee'd, I noticed some fog in my headlamp. I was rather upset but before I could go back to the dealer about it, it vanished. That was last fall and I have not seen any condensation since then. I noticed that there are vents on the back side of the headlight units; perhaps as someone said the temperature difference (between hot light and cold lens in damp conditions) causes the fogging. After everything warms up the fog is evaporated and escapes out the vents.