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.
I agree with what @lienfaye said because if parents can guide their kids well, their kids won't try anything they shouldn't or shouldn't do. Providing proper and good guidance, their children will grow up well and not be interested in gambling. And even though their environment is diverse, their children can take care of themselves well too. Children are like white papers that can be anything, depending on how their parents can guide them. And it will all be the duty of parents to be able to teach their children properly.