**Core Concept**
Smoking, drinking, and certain medications can compromise the blood supply to the socket, leading to impaired healing and increased risk of dry socket.

**Why the Correct Answer is Right**
Smoking reduces blood flow to the affected area by constricting blood vessels, while also decreasing the amount of oxygen and nutrients delivered to the wound site. This impairs the healing process, making it more susceptible to infection and dry socket. Additionally, smoking can also damage the oral tissues and affect the formation of a blood clot, further increasing the risk.

**Why Each Wrong Option is Incorrect**
**Option A:**
- Incorrect because while it may be associated with other oral health issues, it is not directly linked to an increased risk of dry socket.

**Option B:**
- Incorrect because it may actually help to reduce the risk of dry socket due to its antimicrobial properties.

**Option C:**
- Incorrect because while it may be associated with other oral health issues, it is not directly linked to an increased risk of dry socket.

**Clinical Pearl / High-Yield Fact**
Smokers are 2-3 times more likely to develop dry socket, highlighting the importance of advising patients to quit smoking after tooth extraction.

**Correct Answer: C. Smoking.**