I only agree with the term "excess",a gambler becomes addicted to gambling when he gambles excessively and irresponsibly.It's quite obvious that chasing losses and wanting to become rich overnight through gambling are attributes that contribute to gambling excessively.I don't agree with the term "excitement" it is natural for we humans to get excited after a win or a reward,but it's important never to get carried away by your wins because it's outcome may affect ones emotions negatively.