I have vaped around 20 ml or so of kbv hummingbird nectar on the pitch black lava I scored from RIMP on my birthday last year. Twas my first lava. It didn't crack my tank. In fact, I've vaped cinnamon flavors such as Geoffs Blend, which are said to cause tanks to cracks, and have never had a problem. I'm still using the same tank that came with the tank last year.
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