If you are neglecting family time, or you are spending your rent money or grocery money to buy D&D stuff, then yeah you got a problem. Being enthusiastic about something though is not an addiction. Addicts throw away everything else in pursuit of the next hit. If you are cancelling dates with your girlfriend or breaking promises to your child, then it's a problem. Hopefully my examples will help you decide if you are just a really enthusiastic hobbiest or a true addict.