People do it all the time. Rebuidling Kanger single coils is fairly simple, although it can be tedious because they are so small. As with any rebuild, you need to know what you're doing and check ohms before using. Rewicking is easy, but be careful there, too. Too much or too little wick can cause issues, as well. Once you mastered the Kanger coils, you might be ready to get a "real" rebuildable atty and, whoops!, there you go down the rabbit hole!