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Quitting smoking may restore hematological characteristics within five years
Elfrieke Van Tiel1, Petra H M Peeters, Henriette A Smit
1Department of Chronic Diseases Epidemiology, National Institute of Public Health and Environment, Bilthoven, The Netherlands.
Annals of Epidemiology
|August 6, 2002
Summary
Current smoking significantly impacts white blood cell counts and other blood parameters. Hematological markers may take five years or more to normalize after smoking cessation.
Area of Science:
- Hematology
- Public Health
- Epidemiology
Background:
- Smoking is a major risk factor for numerous diseases.
- Understanding its hematological effects is crucial for public health.
- Previous research has explored smoking's impact on blood parameters, but comprehensive analysis across various cell types and cessation timelines is ongoing.
Purpose of the Study:
- To investigate the cross-sectional association between smoking intensity and cessation with leukocyte, platelet, and red blood cell characteristics.
- To quantify the relationship between smoking habits (pack-years, daily cigarette count) and specific hematological parameters.
Main Methods:
- Analysis of 16,254 participants (aged 20-70) from the Dutch European Prospective Investigation into Cancer and nutrition (EPIC) subcohort (1995-1997).
- Linear regression models were used, stratified by sex, to assess associations between smoking habits and hematological measurements.
- Included counts of total and subtypes of leukocytes, platelets, and selected red blood cell characteristics.
Main Results:
- Current smokers showed elevated levels of leukocytes, lymphocytes, monocytes, neutrophils, and platelets.
- Increased mean corpuscular volume, hematocrit, hemoglobin, and mean corpuscular hemoglobin were also observed in smokers.
- Hematological parameters largely normalized in former smokers, with lymphocyte and monocyte counts returning to normal levels 2-5 years post-cessation.
Conclusions:
- Current smoking significantly influences leukocyte counts and, to a lesser extent, erythrocyte and platelet counts.
- Complete normalization of all hematological parameters after smoking cessation may require at least five years.