There are really consequences on our actions. Hence, we must do our very best to be responsible for every of it because we just reap what we sow. If you don't have limitations and let yourself be addicted in gambling, then nonchalantly disregard all of your other duties, the time will come you will suffer the negative effects of it and you will not like it. You have no other options but to face it eventually because running from problems won't really solve it. You're just going to delay the outcomes, but you can't avoid it forever.
Regarding being a drug abuser at the same time, I don't think it fits every time because some addicts aren't really dependent on drugs for dopamine. They have this some kind of cheap thrills from being able to play consecutively and perhaps excessively. So, I think it's not good for us to assume nor to generalized without really backing it up with legitimate references and citations of studies, since addiction is a sensitive topic as well.