That describes someone with maybe an irresponsible but manageable gambling habit, not a gambling addict.

Maybe it's because of pay-at-the-pump popularity now but have you never seen someone standing off to the side of the main gas station counter surrounded by a pile of scratch offs? People exist who will drop their entire paycheck on them in a single day. I've also seen people buy irresponsibly large stacks of Powerball tickets and not just the "oh, I like to fantasize about winning so I buy a ticket each week since you can't win if you don't play". It's gambling all the same.