This is not an easy step that is why we can always talk to the person I suspect is gambling addicted indirectly so that they would not feel bad or felt like what they are doing is very bad. Once we can develop different steps to help people that are addicted to gambling, it would help us to be able to balance what works for a person and what will not work for the next person since we all are quite different.
Holding an addict's attention deserves patience and perseverance. The conversations must be countervailing. It's the duty of the friend to stick around and help out in resolving the problem gambling habit by enduring the whole arguments, misunderstanding, and quarrel that could erupt from the process of changing an addict.
To reduce the rate of such occurrences from happening, dropping the advise strategically would be effective in changing the addict. Kindness attracts addicts to amend their behaviors to a better level. The moment an addict gets involved with the advice of his friend he'd begin to adjust. Hence timing is the ultimate goal of the helper or therapist. Newbies on the other hand, should as well attach themselves with a person who could serve as a temporary therapist and guide to help them escape addiction.