Featured Research

from universities, journals, and other organizations

Secondhand Smoke Increases Risk Of Dementia

Date:
May 2, 2007
Source:
American Academy of Neurology
Summary:
Exposure to secondhand tobacco smoke increases the risk of developing dementia, according to new research. Based on preliminary results, the scientists found that elderly people with high lifetime exposure to secondhand smoke were approximately 30 percent more likely to develop dementia than those with no lifetime secondhand smoke exposure.

Exposure to secondhand tobacco smoke increases the risk of developing dementia, according to new research. For the study, researchers evaluated 3,602 people age 65 and older in the Cardiovascular Health Study. Of those, 985 people had no cardiovascular disease, no dementia, and were never smokers. A total of 495 people reported their lifetime secondhand smoke exposure, with an average of about 28 years of exposure. Then the researchers evaluated which participants developed dementia over a six-year period.

Based on preliminary results, the study authors found that elderly people with high lifetime exposure to secondhand smoke were approximately 30 percent more likely to develop dementia than those with no lifetime secondhand smoke exposure. High exposure was defined as more than 30 years of exposure to secondhand smoke.

"We are still conducting analyses to control for other factors that may be influencing these results, but this finding potentially implicates lifetime exposure to secondhand tobacco smoke as a risk factor for dementia in older adults," said study author Thaddeus Haight of UC Berkeley.

The study also found that exposure to secondhand smoke resulted in a greater occurrence of dementia for people who had not been diagnosed with cardiovascular disease but who had detectable abnormalities of their carotid arteries, based on carotid ultrasound imaging, compared to those without these underlying abnormalities. These abnormalities included narrower carotid arteries and thicker carotid arterial walls, and serve as indicators of preclinical cardiovascular disease and are risk factors for stroke. People with these underlying conditions and high lifetime exposure to secondhand smoke were nearly two-and-a-half times as likely to develop dementia as those with no secondhand smoke exposure and no indications of carotid artery disease.

"This is one of the first studies to look at the risk of dementia in people who never smoked, but were exposed to secondhand smoke," Haight said. "These results show that secondhand smoke is associated with increased risk of dementia, even in people without known risk factors for dementia related to diagnosed cardiovascular disease."

The study investigators used statistical methods to assess the associated risk of exposure to secondhand smoke independent of its known effects on clinically diagnosed cardiovascular disease.

"The fact that there were more people in this study population who were not diagnosed, but had underlying cardiovascular disease compared to people who were diagnosed points to the health risks associated with lifetime exposure to secondhand tobacco smoke in a potentially wider segment of the elderly population," said Haight.

Haight said the study findings provide additional evidence of the hazards of secondhand smoke and provide additional support for policies that seek to reduce the public's exposure to tobacco smoke.

The findings were presented at the American Academy of Neurology's 59th Annual Meeting in Boston which ran from April 28 to May 5, 2007.

The study was supported by a grant from the Flight Attendant Medical Research Institute, University of California, San Francisco.


Story Source:

The above story is based on materials provided by American Academy of Neurology. Note: Materials may be edited for content and length.


Cite This Page:

American Academy of Neurology. "Secondhand Smoke Increases Risk Of Dementia." ScienceDaily. ScienceDaily, 2 May 2007. <www.sciencedaily.com/releases/2007/05/070501142336.htm>.
American Academy of Neurology. (2007, May 2). Secondhand Smoke Increases Risk Of Dementia. ScienceDaily. Retrieved July 25, 2014 from www.sciencedaily.com/releases/2007/05/070501142336.htm
American Academy of Neurology. "Secondhand Smoke Increases Risk Of Dementia." ScienceDaily. www.sciencedaily.com/releases/2007/05/070501142336.htm (accessed July 25, 2014).

Share This




More Mind & Brain News

Friday, July 25, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

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
Can Watching TV Make You Feel Like A Failure?

Can Watching TV Make You Feel Like A Failure?

Newsy (July 24, 2014) A study by German researchers claims watching TV while you're stressed out can make you feel guilty and like a failure. 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