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Development of central and peripheral smoking effects over time
M Hasenfratz1, R Nil, K Bättig
1Comparative Physiology and Behavioral Biology Laboratory, ETH-Zentrum, Zürich, Switzerland.
Psychopharmacology
|January 1, 1990
Summary
Smokers show varied nicotine absorption, impacting physiological responses like heart rate and brain activity. Acute tolerance to smoking develops for some effects but not others, even with increased cigarette consumption.
Area of Science:
- Neuroscience
- Pharmacology
- Human Physiology
Background:
- Cigarette smoking delivers nicotine and carbon monoxide (CO), affecting physiological and neurological functions.
- Individual differences in nicotine absorption can influence the acute effects of smoking.
- Understanding these effects is crucial for smoking cessation and addiction research.
Purpose of the Study:
- To compare carbon monoxide (CO) and nicotine absorption from first morning cigarettes.
- To investigate the effects of smoking patterns on electroencephalogram (EEG) and peripheral functions.
- To examine the development of acute tolerance to smoking effects.
Main Methods:
- Eighteen smokers participated in two experimental sessions.
- Session 1: Smoking two cigarettes in succession.
- Session 2: Smoking three cigarettes at 30-minute intervals.
- Measurements included CO and nicotine levels, EEG (alpha, beta, theta power), heart rate, and finger vasoconstriction.
- Subjects were categorized into high (HN) and low (LN) nicotine absorbers based on absorption levels.
Main Results:
- Smoking two cigarettes in succession created distinct high (HN) and low (LN) nicotine absorber groups with significant differences in CO and nicotine uptake.
- Cardioacceleration was more pronounced and prolonged in the HN group compared to the LN group.
- Dominant alpha frequency increased significantly in the HN group only; beta power increased in both groups.
- Theta power decreased in the HN group only.
- Heart rate, dominant alpha frequency, and beta power changes correlated significantly with nicotine absorption.
- Smoking three cigarettes yielded similar but less pronounced effects, with dominant alpha frequency increasing only in the HN group.
- Acute tolerance developed for finger vasoconstriction, craving, and sickness, but not for cardioacceleration or EEG parameters.
Conclusions:
- Nicotine absorption variability significantly influences acute physiological and EEG responses to smoking.
- The pattern of smoking (two vs. three cigarettes) affects the magnitude but not the qualitative nature of these responses.
- Differential development of acute tolerance suggests complex regulatory mechanisms in response to smoking.
- Individual differences in nicotine absorption are a key factor in understanding smoking's immediate impact.