Put your bitcoin in a wallet. Write the private key on a paper. Hide the paper. Done.
it doesn't matter how much you hide your paper wallet, or where you put the private key.. you will reach for it if you are a real addict. The solution would be to lock your bitcoins and make them frozen so you can't withdraw from the wallet, but a hardcore addict might start getting in trouble if it can't have his gambling fix, so you never know.
Yes that is true, a real gambling addict will do everything just to have money to gamble, and most of them are overall losers and they keep chasing their bets because they don't accept defeat and by doing it they keep losing regularly and the worst thing will happen is to go bankrupt.