A. Hilchos Tzedakah: The halacha requires us to provide the destitute with their needs, ‘Dei Machsoro’ (this is not translated as luxuries). This probably does not include feeding an addiction (aside, perhaps, for one of coffee 😉 )
I’m not so sure about that. Once one is addicted, surely this is a need? Perhaps a harmful, self inflicted need, but a need nonetheless?