How can a close friend be helped to quit the scourge of smoking in order to preserve his health and the well-being of his family?

The prohibition of smoking has been previously explained. A Muslim must beware of violating God's prohibitions, because disobedience is an ugly act, as it is disobedience to God. It has been medically proven that smoking causes lung cancer, heart disease, stroke, emphysema, bronchitis, and impotence. Nicotine is treated like other dangerous drugs, and low-tar cigarettes are misleading and increase cases of lung cancer. Use these proofs to convince your friend, so that he may stop smoking.