I have 4 cobs and 2 have cracks. One is really bad but it was my first and I know it was my own fault. But now I'm beginning to see some hairline cracking on another newer one I thought I was being pretty careful with. I seem to be a "fast" smoker but have slowed to the point to where I have to relight twice at least, and this cob is clean as a whistle. So anybody else have this happen before? Is this fairly normal???