Well into my 3rd month of being smoke free and vaping after 40 years.... quite fanatical about my mini-Davides and have started pulling apart and cleaning the coils, and will try building my own coils soon. Well, despite that experience, I got a free F16, filled it, and somehow promptly fried the atty. Not sure about these things! I'm guessing I was supposed to soak it and leave it for several minutes first before trying it? Will get a refill pack of attys, but don't want to stupidly fry them.....