Honestly, Coby is right, but seriously, even with a 30a fuse, if I shorted the wires out intentionally, I'm pretty sure the fuse would burn before any wiring.
I'm not saying people should use a 20a fuse there, not even saying its ok, I'm just saying its a solution that worked for me, I've had it there for a few years and it has not caused me any grief, unlike the recommended/approve fuse rating.
I also do not smoke, I do not allow smoking in the car from smokers, so the cigarette lighter was one of the 1st things to go in my Balt.
Old Car: Chevy Cobalt 2006 LS Sedan base (Automatic)
New Car: Chevy Impala 2011 LT Fully Loaded (Automatic)