It seems I was not using my e-cig correctly and was going through my carts way too fast. Now that I'm actually using it right (with fiber touching atomizer) I am realizing the old ones which I'm glad I saved are not actually empty. I understand there is no guarantee on it because everyone vapes differently and whatnot, but I'm wondering approximately how much people get out of thier carts before they are truly emptied. I can't imagine they would last as much or close to a pack of analogs like they all claim.