I agree with TX...that what I had to do. Even my mother in law told me that everyone has some type of addiction, if I don't want him smoking crack, I should allow him to drink or smoke pot at home...NOT! One beer leads him straight to the streets...he don't even smoke pot...that woman is alcoholic/addict too...so every time we have a fight, he runs to mommy and then to the streets...
Love him from a distance...take care of yourself...stick to your boundaries.
They will drive you nuts and guilt you by blaming you for triggering them...blah blah blah...
Keep your head up and remember to love yourself enough to put you 1st! (Im still struggling with that one)