Changing Your Coils
The most effective way to combat this problem is to simple replace the coils all together. If your using a tank, this means replacing the coil inside with another compatible part, usually you can buy one from the same place you purchased your atomizer from. If you are using an RDA style atomizer, you can replace the build. This will fix any missing flavors or burnt tastes most of the time! You should replace your coils every week to two weeks depending on your vaping habits.
Another popular choice is "fry firing" the coils, which is only possible in RDAs and RBAs. I do not recommend attempting this with a tank style atomizer. First, you must remove the cotton or wicking material from the coil, and then glow the coils red hot. Remember to hold the coils away from your face while doing so to prevent any e-liquid popping onto you. Wait for them to cool, and then rinse them with a few drops of e-liquid. Now you can vape with flavor and clouds once again!
Why Maintain Your Coils?
It's very important to remember to keep your vaping materials clean, because much of the time the black gunk that coats your coils comes from a buildup of various sweeteners in the e-liquid. Most companies that provide e-liquid use pure Sucralose as sweetener, or a combination of Ethyl Maltol and Propylene Glycol, the latter of which is a far worse culprit to the problem. These sugars stick and burn to the coil over time, building up and creating that troublesome gunk. This is the primary cause of what many call "burning your wick."
Whether your an experienced vaper or a beginner, you'll almost certainly deal with coil gunk. It is imperative that you deal with this, especially with an unregulated device, as it can lead to excess battery strain. Coil gunk is one of the biggest contributors to reducing the lifespan of your equipment, so always remember to clean your MOD and replace old coils!