**Core Concept**
Smoking cessation is a crucial aspect of preventive medicine, and the most effective treatment involves a combination of behavioral interventions, counseling, and pharmacotherapy. The pharmacological approach aims to manage nicotine withdrawal symptoms, reduce cravings, and enhance motivation to quit.

**Why the Correct Answer is Right**
The first-line pharmacotherapy for smoking cessation is a combination of varenicline, a selective nicotinic receptor partial agonist, and bupropion, a norepinephrine-dopamine reuptake inhibitor. Varenicline acts on the alpha-4 beta-2 nicotinic acetylcholine receptor (nAChR) subtypes, reducing the rewarding effects of smoking and alleviating withdrawal symptoms. Bupropion, on the other hand, enhances dopamine release and reduces nicotine cravings. This combination therapy has been shown to increase the chances of successful smoking cessation.

**Why Each Wrong Option is Incorrect**
**Option A:** Nortriptyline is a tricyclic antidepressant that has been used off-label for smoking cessation, but it is not the first-line treatment due to its side effect profile and limited evidence base.
**Option B:** Clonidine is an alpha-2 adrenergic agonist that can reduce withdrawal symptoms, but it is not as effective as varenicline and bupropion combination therapy.
**Option C:** Acupuncture has been studied as a complementary therapy for smoking cessation, but its effectiveness is limited and not supported by robust evidence.

**Clinical Pearl / High-Yield Fact**
When counseling patients about smoking cessation, it's essential to emphasize the importance of setting a quit date, using a combination of pharmacotherapy and behavioral interventions, and providing ongoing support to increase the chances of successful cessation.

**Correct Answer:** B. Bupropion