I actually have a few where the juice is bubbling over and out of the carto. im guessing that its because im using 6V but then again i didnt have this issue with the old cartos. After taking a few drags i change out and then i can pick up that other carto and the juice will be on the white cap of the carto. Come to think of it i use the condom mod on all my old carts so i guess that is why it has never happened to me before.