Featured Research

from universities, journals, and other organizations

No link found between prenatal exposure to tobacco smoke and autism, Swedish study finds

Date:
January 13, 2012
Source:
Drexel University
Summary:
A large population-based study in Sweden indicates that there is no link between smoking during pregnancy and autism spectrum disorders (ASD) in children.

A large population-based study in Sweden indicates that there is no link between smoking during pregnancy and autism spectrum disorders (ASD) in children. The study, led by Dr. Brian Lee, an assistant professor at Drexel University and a team of international collaborators, will appear in a forthcoming issue of the Journal of Autism and Developmental Disorders and was published online in December.

Researchers have considered a variety of chemical exposures in the environment during pregnancy and early life as possible contributing factors in the development of autism spectrum disorders. Many have considered prenatal exposure to tobacco smoke a possible cause due to known associations with behavioral disorders and obstetric complications. Past studies of maternal smoking and autism have had mixed results.

"We found no evidence that maternal smoking during pregnancy increases the risk of autism spectrum disorders," said Lee, an epidemiologist at Drexel's School of Public Health, who led the research in collaboration with researchers from Sweden's Karolinska Institute and the University of Bristol (Bristol, UK). "Past studies that showed an association were most likely influenced by social and demographic factors such as income and occupation that have associations with both the likelihood of smoking and with the rate of autism spectrum disorders."

In the new study, Lee and colleagues analyzed data from Swedish national and regional registries for a set of 3,958 children with autism spectrum disorders, along with a control set of 38,983 children born during the same period who did not receive an ASD diagnosis. Overall, 19.8 percent of the ASD cases were exposed to maternal smoking during pregnancy, compared to 18.4 percent of control cases. These rates showed an association between maternal smoking and the odds of an autism spectrum disorder, in unadjusted analyses. However, the association disappeared when the analysis was adjusted for sociodemographic factors such as the parents' income level, education, and occupation.

The report helps to reassure mothers who smoked during pregnancy that their behavior wasn't likely responsible for their child's autism, Lee said, and "crosses off another suspect on the list of possible environmental risk factors for ASD." He cautioned, however, that smoking during pregnancy is still unhealthy for mothers and has other known risks for their children.

Lee received his Ph.D. and M.H.S. degrees in Epidemiology from The Johns Hopkins University, and graduated Cum laude with an A.B. in Biological Anthropology from Harvard College. His research interests include the epidemiology of neurological development, maintenance and decline, including prenatal environmental exposures and autism risk; gene-environment interaction; and epidemiological methods including causal inference methodology, data mining and machine learning algorithms.

Lee was recently awarded a 3-year grant from Autism Speaks to study whether early immune system abnormalities are associated with the risk of autism spectrum disorders.

The maternal smoking risk study was funded by a grant from the Stockholm County Council.


Story Source:

The above story is based on materials provided by Drexel University. Note: Materials may be edited for content and length.


Journal Reference:

  1. Brian K. Lee, Renee M. Gardner, Henrik Dal, Anna Svensson, Maria Rosaria Galanti, Dheeraj Rai, Christina Dalman, Cecilia Magnusson. Brief Report: Maternal Smoking During Pregnancy and Autism Spectrum Disorders. Journal of Autism and Developmental Disorders, 2011; DOI: 10.1007/s10803-011-1425-4

Cite This Page:

Drexel University. "No link found between prenatal exposure to tobacco smoke and autism, Swedish study finds." ScienceDaily. ScienceDaily, 13 January 2012. <www.sciencedaily.com/releases/2012/01/120112193220.htm>.
Drexel University. (2012, January 13). No link found between prenatal exposure to tobacco smoke and autism, Swedish study finds. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2012/01/120112193220.htm
Drexel University. "No link found between prenatal exposure to tobacco smoke and autism, Swedish study finds." ScienceDaily. www.sciencedaily.com/releases/2012/01/120112193220.htm (accessed July 29, 2014).

Share This




More Mind & Brain News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Losing Sleep Leaves You Vulnerable To 'False Memories'

Losing Sleep Leaves You Vulnerable To 'False Memories'

Newsy (July 27, 2014) A new study shows sleep deprivation can make it harder for people to remember specific details of an event. Video provided by Newsy
Powered by NewsLook.com
University Quiz Implies Atheists Are Smarter Than Christians

University Quiz Implies Atheists Are Smarter Than Christians

Newsy (July 25, 2014) An online quiz from a required course at Ohio State is making waves for suggesting atheists are inherently smarter than Christians. Video provided by Newsy
Powered by NewsLook.com
Beatings and Addiction: Pakistan Drug 'clinic' Tortures Patients

Beatings and Addiction: Pakistan Drug 'clinic' Tortures Patients

AFP (July 24, 2014) A so-called drugs rehab 'clinic' is closed down in Pakistan after police find scores of ‘patients’ chained up alleging serial abuse. Duration 03:05 Video provided by AFP
Powered by NewsLook.com
New Painkiller Designed To Discourage Abuse: Will It Work?

New Painkiller Designed To Discourage Abuse: Will It Work?

Newsy (July 24, 2014) The FDA approved Targiniq ER on Wednesday, a painkiller designed to keep users from abusing it. Like any new medication, however, it has doubters. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins