Hey Vernon,
A few of us have discussed the whole cedar lining idea but I tell ya, personally, I would not waste your time, energy or money.
First off when you put a few cigar boxes in a cooler (most cigar boxes are spanish cedar) you'll get more of that wonderful "cedar" smell than from any lining you'd glue or stick into the cooler (with tapes and adhesives that STINK

)
I have a few wooden cigar boxes in my coolerdor and refrigerdor and everytime I open the doors, I'm greeted by that pleasant cedar aroma. If you don't have any cedar cigar boxes (well you will very soon, don't worry) you can get empty ones from your local cigar shop.
Secondly, you've got the added cost of that cedar. I say use that money on more cigars!!
Thirdly, it's additional time & labor taken away from smoking cigars to install that cedar (now I know I'm getting a little ridiculous here but.........)
And last but not least, when you outgrow that cooler or build a walk-in humi in your house, you can convert the cooler back to its original purpose BEER by merely emptying it instead of having to remove any cedar you glued on it. Or, if you ever have a cooler emergency, you can ziplock bag your stock for the day you need to use that cooler for a party or a tailgate!!