Listen, You will do him a better justice by fixing yourself. Although it may seem difficult at first, you have to be able to say to yourself I am tired of the negative effects my brothers actions have brought to my life. You won't be turning your back on your brother you will be giving him an option. Offer an ultimatum, give him the opportunity to continue a life with you. Say, If you continue this negative behavior I will no longer stay in contact with you and support your addiction.
No problem. I hope everything works out for the best.
Work on you, be a power of example and when he complains you have it better than him tell him when he is ready you are willing to show the way. No nagging involved since active addicts tend to hate that. You can't control the actions of another.
Your welcome. It is hard to watch someone you love fall to pieces.
You know that you can only control yourself and no other.
You should both do it together...
depends what it is; how hard it is to hide/what else it affects