Theoretically, it seems impossible to monitor children's behavior throughout childhood until they reach legal age, but we know that every person is subject to the influences around him. It would be better for that environment to remain free of people addicted to any habit.
Still as parents, we have t oget some of those moments that we get to monitor them secretly or publicly.
It's true that the main influence is with whom they are always with. And we have to protect our children from these people who are addicted in gambling because they might also be influenced by them.
Kids are easy to be influenced, having some simple talks and encouragement and they will believe quickly.