Final answer:
The best nursing intervention is suggesting nicotine replacement therapy, which can help reduce withdrawal symptoms and assist in smoking cessation.
Step-by-step explanation:
The best nursing intervention to correct the unmet outcome of a client who has almost reached the goal of smoking only one-half pack of cigarettes a day is D. Suggesting the use of nicotine replacement therapy. While giving praise (option B) is important for encouragement, and providing education (option C) is helpful, many smokers are already aware of the risks. Setting a new goal (option A) is also beneficial, but does not directly assist in overcoming the physiological addiction. Nicotine replacement therapy, such as the use of gum, lozenges, or patches, delivers nicotine in a way that can lessen withdrawal symptoms, helping to break the habit of smoking. Though it's important to be aware that a significant percentage of people return to smoking within a year, nicotine replacement remains a practical step towards cessation.