All those years of tobacco scraps that have accumulated in your pants pockets/jacket pockets/car crevices/couch crevices...basically everywhere, they are extremely jealous of your vaping and will attempt to contaminate all your cartos and batteries and tanks.
Even in a closed Vapor4Life case, they slide in and try to attack my cartos and Titan.
I 've had at least one tobacco flavored carto that was actually only mango juice inside it!
And yesterday I threw my Ego in my pocket for the first time and the post ring got filled with the stuff.
Good thing i spotted it before hooking up the tank at Mom and Dad's house to show off my smoke free status.