Disease can be passed to another person or get spread and addiction doesn't do that. It could be categorized as a mental problem that range from mild to a very serious addiction on gambling.
Yeah and mental problem is a disease. So gambling addiction is disease. Well maybe you do not think of mental problems as disease, but I do. Gambling addiction must be cured, if it is extreme and the gambling addict is aware he is addicted and wants to quit, rehab can be a solution, but if you want to slowly in his own way can also work, it's just that you should be more patient and should not easily give up.
It is a form of mental disease. I really hate addiction to gambling because it once destroyed our family. All our properties were gone into thin air because of my dad's addiction to gambling. I was very young then but I understand everything. It pained me a lot to see that we sold our house and lot to cover the debts of my father. We left the place and start to zero again. I hope it will not happen again to us.