Which cotton should you choose?
Forget the cotton balls from the pharmacy that taste like a used bandage. In vaping, we use untreated organic cotton (Japanese or specific blends). Good cotton needs to suck up juice faster than a kitchen sponge to avoid a dry hit—that fabulous moment where your lungs suddenly regret every life choice you've ever made.
Technically, wicking capability is the number one criterion. High-quality cotton resists high temperatures better and doesn't collapse. Make sure it’s snug enough in the coil to touch the wire, but loose enough to let the juice flow. It’s a fragile balance between a leaking tank and a forest fire in your throat.