I have been getting to try more and more Cubans lately(yippi).Also before I aquire these ,as with most of my buys, I try and do some research,reviews from fellows here, and the usual other places, so I know it is not just me .I know this does not only apply to Cubans but also some high end smokes.But I seem to notice it more with those ISOM smokes.I understand the build up of tar as the cigar get closer to end but sometimes it is right away or changes two or three times as I go. So why? Dave