But it's a choice. If there are gamblers who play excessively, it is their will not to control themselves, leting gambling influence them negatively. Because if you're wise to think on what should be the right thing to do, then you will refrain yourself even it is tempting.
Those who gamble to have fun are aware of the negative consequences if they go beyond their limit. Gambling is not entirely a bad habit since it has positive and negative effect depending on the player. Because the gambler itself will determine how he wants gambling affect him and it depends on his mindset and main desire on why he wants to gamble.
It is not that easy, brain scans have been performed to addicted gamblers and their brains are very different than what you can see in a regular person, basically the part of their brains that should allow them to stop is broken, think of this as driving a car without brakes, it will be incredibly dangerous and it will be impossible to stop at will when you truly need it, this is what the addicted gambler has to deal with, so even if they want to stop they cannot really do it.
For some people who are addicted to gambling, of course it will be very difficult for them to stop even though they have experienced several losses on the bets they have played, as long as they still have money to bet, of course they will continue to gamble in the hope of winning from each bet. that they play and it is difficult for them to stop and the only thing that can stop them is when they no longer have funds that they can use to bet.