Passage Summary: Research indicates that regular smokers have better short-term memory right after a cigarette than people who don't smoke at all. For most of these smokers, this memory boost stays active for at least eight hours.

Reasoning: Regular smokers who have just smoked show better short-term memory than nonsmokers, and this advantage usually lasts for at least eight hours.

Analysis: For this 'Must be False' question, we need to identify a statement that contradicts the provided facts. The stimulus establishes a clear hierarchy: a regular smoker (post-cigarette) outperforms a nonsmoker in short-term memory, regardless of whether the nonsmoker also smoked. It also notes the duration of this effect for the majority of smokers. We should look for an answer choice that claims a nonsmoker has superior memory to a regular smoker who recently smoked, as that would directly violate the 'typically display significantly better' rule established in the text.