This is probably, the most frustrating aspect of any addiction, every single person that has ever known the addicted can tell they have a problem and they are in a desperate need of their help, but if they cannot take the first step and admit they have a problem then there is nothing anyone can do for them, and if anything trying to do so will only create friction between the two of you as they will think you are trying to take decisions over their life you have no business taking.
The most common way the addiction was not felt by them,they get addicted by the gambling,drinking,smoking.Until their friends point out the same to their friends,they won’t consider this as the addition.