I'm looking at the description for these tanks at various vendors, and they are all pretty much the same copy, not indicating the construction material one way or another.
However, the replacement tanks from Joyetech do state that they are GLASS. I'll keep looking.
Back when I first started vaping and was trying a lot of different liquids, I HAVE had reactions to citrus, cinnamon, clove and a few others when using plastic tanks (from Halo). First the plastic tanks get really cloudy, then they crack.
Not being argumentative, just wondering if it was really the liquid that did this tank in. Hmmmmmmmmm