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Cigarette smoking and ethane exhalation in humans
M P Habib1, N C Clements, H S Garewal
1Section of Pulmonary Medicine, Veterans Affairs Medical Center, Tucson, Arizona 85723, USA.
Summary
Smokers exhale significantly more ethane gas than non-smokers, with levels returning to normal within 3 hours. Antioxidant trials may reduce this exhaled ethane.
Area of Science:
- Biochemistry
- Pulmonary Medicine
- Environmental Health
Background:
- Cigarette smoking introduces various compounds into the body.
- Ethane, a byproduct of lipid peroxidation, can be measured in exhaled breath.
- Elevated exhaled ethane may indicate increased oxidative stress.
Purpose of the Study:
- To quantify the time course of exhaled ethane in smokers and non-smokers after smoking.
- To compare baseline ethane levels between smokers, ex-smokers, and non-smokers.
- To investigate the effect of beta-carotene supplementation on exhaled ethane in smokers.
Main Methods:
- Gas chromatography was used to measure alveolar ethane in breath samples.
- Breath samples were collected immediately after smoking and hourly thereafter.
- Baseline ethane levels were compared across different smoking status groups and after beta-carotene treatment.
Main Results:
- Exhaled ethane peaked immediately after smoking, reflecting cigarette smoke content, and declined exponentially.
- Smokers exhibited higher baseline ethane levels (2.90 pmol/min/kg) compared to ex-smokers (1.55 pmol/min/kg) and non-smokers (1.11 pmol/min/kg).
- Beta-carotene supplementation reduced exhaled ethane by 80% and 35% in two smokers.
Conclusions:
- Cigarette smokers have significantly elevated baseline levels of exhaled ethane.
- Exhaled ethane levels in smokers return to baseline within 3 hours post-smoking.
- Antioxidant interventions, such as beta-carotene, show potential in reducing exhaled ethane, suggesting a role in mitigating smoking-induced oxidative stress.