Most times you dont really know you are addicted. At some point, you get addicted and come out of it. Well, I will say it is the mindset and self awareness. When you get addicted, you wont know unless you realize later that the habit is becoming part of your daily routine and that you cant stop yourself from gambling. When gambling becomes a hindrance to your life, growth and fulfillment, it becomes an addiction. At that moment you should quit gambling, if you dont, you begin to find yourself getting deeper until it becomes very difficult to quit.