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Published on: February 12, 2015
Adolescent nicotine metabolism: ethnoracial differences among dependent smokers
Eric T Moolchan1, Frederick H Franken, Maria Jaszyna-Gasior
1National Institute on Drug Abuse, Intramural Research Program, National Institutes of Health, Department of Health and Human Services, Baltimore, Maryland 21224, USA. etmoolcha@intra.nida.nih.gov
African American adolescents smoke fewer cigarettes per day due to slower nicotine metabolism, indicated by lower nicotine metabolite ratios (3HC/COT). This finding suggests ethnicity influences nicotine dependence and treatment needs in youth.
Area of Science:
- Biochemistry
- Pharmacogenetics
- Adolescent Health
Background:
- Nicotine metabolism variations influence smoking behavior across ethnicities.
- Lower smoking rates in African American adolescents seeking cessation are documented.
- Cytochrome P450 (CYP) 2A6 activity is a key determinant of nicotine metabolism.
Purpose of the Study:
- Investigate the mechanism behind lower smoking rates in African American adolescent smokers.
- Measure nicotine metabolite ratios to assess nicotine metabolic disposition.
- Explore ethnoracial differences in nicotine metabolism and cigarette consumption among adolescents.
Main Methods:
- Analyzed plasma ratios of trans-3'-hydroxycotinine (3HC) to cotinine (COT) in 92 adolescent smokers.
- Utilized independent t tests to compare groups based on ethnicity.
- Examined differences in cigarettes per day (CPD) and nicotine metabolite ratios.
Main Results:
- African American adolescents had significantly lower CPD (15.1 vs 19.6) and 3HC/COT ratios (0.27 vs 0.35) compared to Caucasian adolescents.
- Higher cotinine/CPD ratio observed in African American adolescents suggests slower metabolism.
- Findings remained significant when analyzing menthol smokers by ethnicity.
Conclusions:
- Slower nicotine metabolism in African American adolescents may explain lower cigarette consumption.
- Ethnoracial differences in nicotine metabolism are evident in adolescents, mirroring adult patterns.
- Need for ethnicity-independent measures of nicotine dependence and tailored treatment selection in adolescent smokers is highlighted.
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