Is it permissible to give Zakat to one's sister's husband, who has a sufficient salary and wishes to complete the finishing touches on an apartment built for him by his father and brothers, and who needs funds for furnishing and heating, knowing that he is a smoker? Should he be given all of the Zakat or only a portion of it? And is he considered to be among the needy (Masakeen)?

It is permissible to give Zakat to a brother who smokes if he does not have enough for his basic needs and those he supports, or if the money is for essential finishing work in his home, not for luxury. There is no need to inquire about his basic needs; it is sufficient to act based on a strong presumption, though it is commendable to ask for confirmation. Smoking does not prevent giving Zakat to him unless it is known that he will use it to aid in sin, and he should be advised. If there is doubt about his eligibility, Zakat should be given to someone whose eligibility is certain. Giving Zakat to him is preferable due to maintaining kinship ties, and distributing it depends on what is most beneficial. It appears that he falls under the category of the poor as long as his situation remains as described.