since common thing we know in gamblers is that we can't control and resist to spend our money especially if you regularly play gambling. Being responsible is hard, even we tell that this is the only amount we spend, we can't stick to our target and it is really hard.
This is the basic difference between a addicted gambler and a person who gambles just for fun while his source of income is something else. Usually people who are affected with Gambling Problem are those who are aged between 19-30 years because this is the stage of life where a student does not have any pressure for earning money and they usually have the mentality to make some money
easily. Now this word easily is where the problem lies in, they try gambling and they win a few bets and start feeling like this is the easiest way to earn money. Now not everyone has control over their adrenaline rush and they follow what they feel is good.
The end is disastrous - I have seen people go bankrupt, loans from friends been taken and spent in gambling and it's hard to make a com back. So, yeah have some control when you are gambling and see it as a extra activity.