That's right, I want to add to your words that the greatest dependence often appears after a player has received a large win after he entered the gambling field. Such a beginner gambler begins to believe in his chosen one, and such a win has two types of influence on the gambler:
At First, money changes live - and understanding this is pleasant.
Secondary, the player is experiencing a storm of emotions, his being chosen. And this emotional aspect is remembered by gambler forever. And then he wants to get that feeling back.
It is ironic that the newbies that are the luckiest at the beginning are in fact the ones that could suffer the worst effects from gambling, and this is because in their minds gambling will go from a hobby which they may enjoy once in a while, to a way to make money in a consistent way, and this is a very problematic change on their beliefs, as there is no way for someone like them to actually achieve their goals, so very soon they will lose all the money they won and more.
Whatever the wins money that the gamblers gets will makes them back to playing gambling because at that time, they already started dependence of gambling and they wants to gets wins in the next rounds. Even if that gamblers have a good self control, he can gets tempts of his winning and wants to keeps playing gambling without thinks that he already won. He forgets what he must do when playing gambling and only follows his desires to keeps playing gambling and chase the other winning.
That's ironic but we can't do anything to them because they will not listen to us who always suggest them to prevents their gambling activity not becomes too often. They thinks that they can wins in the next rounds but that will not always happens and they just make many mistakes and difficult to realizes. Maybe they will realizes after they lost everything they have but that's too late because they don't have anything.