Crack Talk: After making Nano's for 4 years now. (WOW) I have not noticed a statistical difference between cracking on Maple, Cherry or Walnuts. I can't really can't tell when they are going be prone to cracking while manufacturing them or with age. Most seem to crack within a year if they are going to. There have been a few that are over 2 years old that suddenly give up, but very few, and I have covered them all under warranty. That said, Maple burls NEVER crack. I believe it's because they have a random grain pattern so they can expand and contract as a unit and not along a single weak grain line. Cracks will not affect the performance of the vape with the exception of a crack that starts at the corner of the AC plug. This usually requires sending the vape in for repair as the plug may come loose. Checking of the wood is different from a crack and will usually arrest itself and adds character. Ace PS: Shout out and thanks to High Times magazine for choosing the E-Nano as one of the top-10 desktopvapes of 2017! Maybe now log vapes will start getting the respect they have so long deserved.