I do greatly appreciate your concern for your fellow human beings. It is very admirable.
Here's my point. Just as you correctly stated that the additional resources could be used to continue an addiction (in this case), the resources you potentially provide could just as easily provide the turning point for the person to get their life together.... who knows, maybe move away from the social environment that is causing the addiction.. Point is, non of us of the omnipotence to see the future and make the proper decision.