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Smoking remains associated with education after controlling for social background and genetic factors in a study of 18 twin cohorts
Department of Social Research, Faculty of Social Sciences, University of Helsinki, Helsinki, Finland ; Center for Twin Research, Osaka University Graduate School of Medicine, Osaka, Japan.
UKK Institute – Centre for Health Promotion Research, Tampere, Finland ; Institute for Molecular Medicine Finland FIMM, University of Helsinki, Finland.
Department of Physiology, Faculty of Medicine and Nursing, University of the Basque Country, Leioa, Spain ; Department of Public Health, University of Helsinki, Finland.
Department of Social Research, Faculty of Social Sciences, University of Helsinki, Finland ; Institute of Clinical Medicine, University of Eastern Finland, Kuopio, Finland.
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2022 (English)In: Scientific Reports, E-ISSN 2045-2322, Vol. 12, no 1, article id 13148Article in journal (Refereed) Published
Abstract [en]

We tested the causality between education and smoking using the natural experiment of discordant twin pairs allowing to optimally control for background genetic and childhood social factors. Data from 18 cohorts including 10,527 monozygotic (MZ) and same-sex dizygotic (DZ) twin pairs discordant for education and smoking were analyzed by linear fixed effects regression models. Within twin pairs, education levels were lower among the currently smoking than among the never smoking co-twins and this education difference was larger within DZ than MZ pairs. Similarly, education levels were higher among former smoking than among currently smoking co-twins, and this difference was larger within DZ pairs. Our results support the hypothesis of a causal effect of education on both current smoking status and smoking cessation. However, the even greater intra-pair differences within DZ pairs, who share only 50% of their segregating genes, provide evidence that shared genetic factors also contribute to these associations.

Place, publisher, year, edition, pages
Nature Portfolio , 2022. Vol. 12, no 1, article id 13148
Keywords [en]
maternal smoking, adolescence, pregnancy
National Category
Public Health, Global Health, Social Medicine and Epidemiology
Research subject
Wellbeing in long-term health problems (WeLHP)
Identifiers
URN: urn:nbn:se:his:diva-21681DOI: 10.1038/s41598-022-17536-xISI: 000834000600001PubMedID: 35909142Scopus ID: 2-s2.0-85135182674OAI: oai:DiVA.org:his-21681DiVA, id: diva2:1687335
Funder
Swedish Research Council, 2017-00641NIH (National Institutes of Health), NIA R01 AG018384NIH (National Institutes of Health), R01 AG018386NIH (National Institutes of Health), R01 AG022381NIH (National Institutes of Health), R01 AG022982NIH (National Institutes of Health), R21 AG039572Academy of Finland, 213506Academy of Finland, 129680Academy of Finland, 100499Academy of Finland, 205585Academy of Finland, 118555Academy of Finland, 141054Academy of Finland, 265240Academy of Finland, 263278Academy of Finland, 264146
Note

CC BY 4.0

Attribution 4.0 International

Correspondence and requests for materials should be addressed to K.S.

This study was conducted within the CODATwins project. Open access funded by Helsinki University Library. Support for collaborators: This research was facilitated through access to Twins Research Australia, a national resource supported by a Centre of Research Excellence Grant (ID: 1079102), from the National Health and Medical Research Council. Data collection and analyses in Finnish twin cohorts have been supported by ENGAGE – European Network for Genetic and Genomic Epidemiology, FP7-HEALTH-F4-2007, Grant Agreement Number 201413, National Institute of Alcohol Abuse and Alcoholism (Grants AA-12502, AA-00145, and AA-09203 to R J Rose, the Academy of Finland Center of Excellence in Complex Disease Genetics (Grant Numbers: 213506, 129680), and the Academy of Finland (Grants 100499, 205585, 118555, 141054, 265240, 263278 and 264146 to J Kaprio). Since its origin the East Flanders Prospective Survey has been partly supported by Grants from the Fund of Scientific Research, Flanders and Twins, a non-profit Association for Scientific Research in Multiple Births (Belgium). Anthropometric measurements of the Hungarian twins were supported by Medexpert Ltd., Budapest, Hungary. Korean Twin-Family Register was supported by the Global Research Network Program of the National Research Foundation (NRF 2011-220-E00006). The Murcia Twin Registry is supported by Fundación Séneca, Regional Agency for Science and Technology, Murcia, Spain (19479/PI/14) and Ministry of Science and Innovation, Spain (RTI2018-095185-B-I00, co-funded by European Regional Development Fund (FEDER)). Osaka University Aged Twin Registry is supported by Grants from JSPS KAKENHI JP (23593419, 24792601, 26671010, 24590695, 26293128, 16K15385, 16K15978, 16K15989, 16H03261). The Swedish Twin Registry is managed by Karolinska Institutet and receives funding through the Swedish Research Council under the Grant No. 2017-00641. Vietnam Era Twin Study of Aging was supported by National Institute of Health Grants NIA R01 AG018384, R01 AG018386, R01 AG022381, and R01 AG022982. The Cooperative Studies Program of the Office of Research & Development of the United States Department of Veterans Affairs has provided financial support for the development and maintenance of the Vietnam Era Twin (VET) Registry. The content of this manuscript is solely the responsibility of the authors and does not necessarily represent the official views of the NIA/NIH, or the VA. The NAS-NRC Twin Registry acknowledges financial support from the National Institutes of Health Grant Number R21 AG039572.

Available from: 2022-08-15 Created: 2022-08-15 Last updated: 2022-10-31Bibliographically approved

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Dahl Aslan, Anna K.

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