LD needs to check his mail when he gets home. 
I vary rarely use "plastic" tanks unless they are polypropylene. When I do, I only use the most benign flavors available. No fruits, just tobaccos, chocolates, and coffees. I don't know what's in "Homemade Sassafras ejuice", but I guess there was some kind oil in there or anise. Tasty or not, liquids that melt plastic kinda freak me out. YMMV
I vary rarely use "plastic" tanks unless they are polypropylene. When I do, I only use the most benign flavors available. No fruits, just tobaccos, chocolates, and coffees. I don't know what's in "Homemade Sassafras ejuice", but I guess there was some kind oil in there or anise. Tasty or not, liquids that melt plastic kinda freak me out. YMMV