Grоss, а 55-yeаr-оld mаle with a 30-year histоry of smoking, is admitted to the critical care unit (CCU) following a spinal cord injury sustained in a car accident. As part of his care plan, the nurse applies anti-embolic stockings to prevent deep vein thrombosis (DVT) and counsels John on the importance of smoking cessation to aid his recovery. Considering John’s condition and history, which medication would be most beneficial for him?