Baditude has a blog that lists a blog that covers the flavors that may crack certain tanks. He also covers (with pics!) the various tanks available that do and that do not crack. Good tips here.
http://www.e-cigarette-forum.com/fo...6-something-safe-cinnamon-citrus-flavors.html
http://www.e-cigarette-forum.com/fo...6-something-safe-cinnamon-citrus-flavors.html