Well,another option is to put him in the drivers seat.You could research rehabs,and such things,present them with a list of some changes you need in order for him to remain,and tell him that the outcome of his situation depends on changes & the choices he makes.Can you p.m me on what he is addicted to,his age,and your area? I could help you research different options for him,so that it will come down to the fact that....as happens to all of us,he understands that his choices are his responsibility.This way,in retrospect,he can see that you care,and that he decided the outcome in the end.You can tell him,"I love you,and care what happens to you,I always will.But,these things you are doing (u can list them) are causing emotional turmoil for me,and me supporting your patterns isn't healthy for you either.This is what I want to see from you,and the rewards consequences for compliance are as follows",can include eviction,reduction of assists etc.,but give him a realistic timeline.You can be a bit flexible,and even say ahead of time what bits you may choose to be flexible with.IDK,really,I had these same issues.I didn't fare too well,I understand loving a person (your child),feeling guilty for putting your foot down,and feeling torn about it.The circumstances surrounding my sons issues were a bit different likely as well.