Which symptom is least likely associated with exposure to hazardous materials?

Improved memory is least likely associated with exposure to hazardous materials because, in general, exposure to such substances typically leads to detrimental health effects rather than cognitive enhancement. Hazardous materials can cause various health issues, including respiratory problems, skin irritation, and dizziness, but they generally do not enhance brain function or memory. Instead, the impact of hazardous materials often results in confusion, memory loss, or cognitive deficits, particularly with prolonged exposure to certain chemicals. Therefore, the notion that exposure would lead to improved memory is inconsistent with established knowledge about the effects of hazardous materials on human health.