The standard carts 3.2 ohms burn also at 3.7 volts. If you don't take them apart you will never know, that they do burn the diaper. Please folks take them apart when they quit working and let us know if you don't see gunk or burned diaper, and if you do see gunk and burnt diaper let us now also. If you don't use a clearomizer you will never see it.No wonder they are burning. 1.7 ohm cartos at 6 volts is over 21 watts.