A few months ago I got the hubby a bottle of Menthol Moon Drops to try. He has been adding a drops to his wintergreen right into his Mini Nova & loving it! Maybe too much....There is no warning on the web site about plastic interaction but his Nova tank started leaking around the bottom. I got him two of the metal replacement tanks just incase. Yesterday both his drip tips melted away....Anyone else have issue with Moon Drops? He may have added just way too much....He guessed maybe 2/3 Wintergreen to 1/3 Menthol...forgot to ask if he shook it but he learned that long ago & it's sort of a natural step for us both.