While that may be the case, most of my lures have been stored in a dry, dark enclosure for close to 20 years now. That lure in question however split within the first hour of using it right after I got it. The outer sealer/clear coat has cracked in several places and, in my opinion, was never done the right way to begin with. I know of other factory lures of the same style that have been left in the hot boat over the summer for years and years and have been dropped to over 250 feet and remain in perfect working order.
So, while there is most likely moisture in certain grains of the wood, a properly sealed lure shouldn't have this trouble in the first place... That is what I'm hoping to avoid altogether by find a good lure maker that knows what they are doing to prevent any cracking at all.