Hi Debbie
I wish there was an easy, quick answer to your question but there is no crystal ball available to tell me is this is a one-off incident.
Personally, I think it is wise to think that this could be the start of something -but hopefully with knowledge it can be nipped in the bud.
Your son is at an age when many young people gamble for fun without realising that addiction can be waiting for them and along with addiction can be a life-time of failure and misery. You, however, have chosen to seek help early for him and he is a lucky young man that you are ready to support.
Debbie, I was just going out for the evening when I noticed your post, so I hope you will excuse this short reply.
I will write more fully tomorrow – but I wanted you to know I was listening. in the meaning your plan to keep him occupied and his friends in the loop sounds great.
Speak soon
Velvet