I wouldn’t go as far as 3 months. There is still cotton used in a cCell coil which does eventually break down. There is also a coil which does get gunked up. Month tops!
I use to be a huge fan of cCells and gave them much praise here on ECF. There have been many reports over the interwebs of the ceramic breaking down into a dust which if inhaled, is not the healthiest thing to do. Will admit I ignored much of this, and even read a so called lab report claiming no harmful material was found. But still had concerns. If anyone has ever taken apart a cCell coil knows how easily the ceramic can break apart. I stopped using cCells after finding what I will assume was ceramic dust within the blister pack.
You can take my experience for what it is, I am not trying to tell anyone what to use or what not to use. But do feel this is important information to know which could be taken into account when assessing our own risks with vaping.
@RebeccaD – if looking for GT Core coils, be it cCell or other, Dashvapes is one of, if not the cheapest in the city.