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Updated: May 19, 2026

Cigarette Smoke Exposure in Mice using a Whole-Body Inhalation System
Published on: October 22, 2020
Exposure to second-hand smoke damages everyday prospective memory
Thomas M Heffernan1, Terence S O'Neill
1Collaboration for Drug and Alcohol Research (CDAR), Division of Psychology, Northumbria University, Newcastle upon Tyne, UK. tom.heffernan@northumbria.ac.uk
Second-hand smoke exposure may impair time-based prospective memory (PM) in non-smokers. This cognitive function, crucial for daily life, was significantly lower in those exposed to SHS compared to unexposed individuals.
Area of Science:
- Cognitive Psychology
- Neuroscience
- Public Health
Background:
- Prospective memory (PM) is essential for daily functioning, involving remembering future intentions.
- Second-hand smoke (SHS) exposure is a widespread environmental risk factor.
- The cognitive effects of SHS exposure, particularly on PM, are not fully understood.
Purpose of the Study:
- To compare objective prospective memory performance between never-smokers exposed to SHS, current smokers, and never-smokers with no SHS exposure.
- To investigate the impact of SHS on different types of PM tasks (time-based and event-based).
Main Methods:
- An existing groups design compared three groups: SHS-exposed never-smokers, current smokers, and non-exposed never-smokers.
- Participants were university undergraduates aged 18-30.
- Objective PM was assessed using the Cambridge Prospective Memory Test (CAMPROMPT).
Main Results:
- The non-SHS group significantly outperformed the SHS and current smoker groups on time-based PM tasks.
- The SHS group performed significantly better than the current smoker group on time-based PM.
- Both non-SHS and SHS groups recalled significantly more event-based PM tasks than the current smoker group.
Conclusions:
- Non-smokers regularly exposed to second-hand smoke may experience impairments in time-based prospective memory.
- These findings highlight a potential cognitive cost of SHS exposure.
- Further research is warranted to explore the long-term neurological implications of SHS.
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