You will become addictive once you experienced the so-called "beginner's luck" or early big-win. But then after that, you will try to re-coup what you have lost and ended up an addict.
Not really if you know what you are doing since the beginning and you tried gambling first time with a long term commitment in your mind. So you already have a plan what you will do (I am talking about sports betting) and you will put aside a monthly bankroll and play only with it. If you go out of the borders ,addiction is all you will get and it will bad for your money and health.