anyone ever experience an ashtray or wet rag flavor on the finish of some cigars? it is different from the bitter vinegar flavor from young cigars. i recently smoked a cigar that had some decent chocolate/cinnamon/pumpkin pie flavors upfront, but as they faded all that was left was this dank ashtray flavor. I only smoked about 1/3 as a result. Anyone know what causes this? is it a permanent trait or can it go away with age?