Got my clear tank for my Penelope two days ago. I was using tobacco juices in until today and all was fine. Today I put in some cherry flavored juice I got as a free sample. I knew not to trust cinnamon or citrus but didn't know cherry was a problem. In a few hours the entire inside was covered with fine hairline cracks. I will continue to use the tank (tobacco only) as long as it doesn't leak. I'm kind of bummed because I really liked the way it looked and the convenience of being able to see your liquid.