**Core Concept**
Tobacco amblyopia refers to a condition of vision impairment associated with tobacco consumption, particularly affecting the optic nerve. The underlying principle involves the toxic effects of tobacco on the optic nerve, leading to a deficit in vision.

**Why the Correct Answer is Right**
The correct answer is related to the toxic effects of tobacco, specifically **cyanide** and other toxins found in tobacco, which damage the optic nerve. This damage leads to a decrease in visual acuity, particularly affecting the central vision. The mechanism involves the inhibition of **cytochrome c oxidase** in the optic nerve, disrupting cellular respiration.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because while tobacco does contain numerous harmful substances, the specific mechanism of amblyopia is more directly related to cyanide toxicity.
**Option B:** Incorrect as it is not directly related to the pathophysiology of tobacco amblyopia.
**Option C:** Incorrect because, although tobacco is harmful, this option does not accurately describe the cause of amblyopia.

**Clinical Pearl / High-Yield Fact**
Tobacco amblyopia is a significant clinical condition that highlights the detrimental effects of tobacco on vision, emphasizing the importance of cessation.

**Correct Answer:** D. Cyanide toxicity.