**Core Concept**
Buerger's Disease, also known as thromboangiitis obliterans, is a rare and complex disorder characterized by inflammation and thrombosis of small and medium-sized arteries and veins, typically affecting the limbs.

**Why the Correct Answer is Right**
Buerger's Disease is strongly associated with smoking, particularly heavy and prolonged tobacco use. The exact pathophysiology is not fully understood, but it is believed to involve an immune-mediated response, with the involvement of neutrophils and platelets in the thrombotic process. The disease primarily affects young male smokers, and the exact mechanism of how smoking triggers the disease remains unclear.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because while smoking is a significant risk factor, it is not the only associated factor. Buerger's Disease can occur in non-smokers, although this is rare.
**Option B:** This option is incorrect because while there may be some overlap in clinical presentation, Buerger's Disease is distinct from Raynaud's phenomenon, which primarily affects the digital arteries and is more common in women.
**Option C:** This option is incorrect because while diabetes mellitus can cause peripheral artery disease, it is not directly associated with Buerger's Disease.

**Clinical Pearl / High-Yield Fact**
Buerger's Disease is a classic example of a disease that is heavily influenced by lifestyle factors, particularly smoking. The disease is often resistant to treatment, and smoking cessation is the most effective management strategy.

**Correct Answer:** D. Smoking