You can't make anyone change about anything, actually. but in the case of addiction, interventions sometimes work. You could look into that. It must be done with a professional CAC in charge (certified addictions counselor) or (trust me; I tried) you'll screw it up royally if you try yourself without training or support or anything.
Or you could detach with love and do nothing but pray. I
'm not opposed to interventions or anything that might work as long as everyone knows there are no gaurantees.