There a different thing how do the parents will let their children grow up that's the reason there's guidance barely needed to upon growing up by the child and seeing that this kind of thing is normal in playing gambling they think it is just okay that's the reason why some of them getting addicted because it is normal thing to them because they see already in their parents activity, if you are responsible parent still it is good to let them know your child what is wrong and right so they prevent getting the same scenario as you that part of gambling habit.
Parents should be the first teacher to guide the kids to be a better person. The kids can be easily influence on the kind of environment, the people around them and what they see as they grow up. Hence if the parents are a gambler and exposing their kids to this activity, the kid might think it's normal and will used to it. That's why the kind of person your kids will be are depending on what kind of parents you are. Kids will first learn at home thus we must guide them and don't let them see the activities that are not apporopriate for them and only meant for adult.