Hard to say. I have some sticks that had that problem after 10 or so years, but I was digging in the humi last night for the wife and recall seeing sticks still in the cello and pretty good shaped (dark yellow) that had to be from the mid to late 90's (she doesn't smoke as much so her stock is pretty old). I guess not all cello is created equal or maybe just the oil release on some cigars caused the cello to breakdown faster??