I was just reading in a very old thread about how the resistance of atomisers can increase over time... I'd only looked it up because the carto im using in my tank at the moment started out at 1.9 and is now on 2.9. Seems to be quite a hefty increase in the week or so I've been using it - especially in comparison to vivi nova / kanger tanks which i'd only noticed something like a .2 increase in over a much longer period of time. (I have been hammering the carto tank since i stuck it on though.. barely used anything else and i've been turning up the volts far more than on previous tanks)
That is all the gunk building up on the coil cody, so resistance will indeed increase. when i used carto`s i only got a few days out of one before replacing it.
Basically that`s why i stopped using them.



