Also true, it's on the person itself whether to take part in gambling or change his way but the influence it can bring can't be deny which if the kids see things as normal usually they will follow that track, thinking that its' just normal since they are seeing adult people that surrounds them are just doing it without any conviction.
It is we adults that we know that we are gambling with caution and we know the pros and cons of the gambling. The kids and children who see their parents gambling, won't know any other thing but just to gamble. So they only want to copy the things that they see physically and what is running in their parents' minds, while gambling, they are unable to know about this. So that is why the kids think that since their parents always gamble, they should do the same.
This how important your cares about your kids or on the young minds that still in your vicinities, they can be influence if you are not careful with how you treat your gambling.
Unless to tell the kids that you are gambling with all the good and bad things, it is more dangerous for the kids to get influenced to gamble just by watching the adults doing so. So in my point of view, either stop gambling in front of kids and if you can't, then at least take your kids in confidence and tell them what is gambling with all its drawbacks in particulars.