In a study of women smokers, those whose spouses also smoked had a higher risk of stroke than those married to nonsmokers, according to a study in Stroke: Journal of the american heart association.

"There is evidence suggesting that your exposure to secondhand smoke can increase your chances of getting heart disease. We asked if that was also true for stroke," said the study's lead author Adnan I. Qureshi M.D., professor and director of the Cerebrovascular Program in the Zeenat Qureshi Stroke Research Center at the University of Medicine and Dentistry of New Jersey in Newark.

Researchers analyzed data from 5,379 U.S. women who participated in the First National Health and Nutrition Examination Survey Epidemiologic Follow-Up Study. The researchers then recorded the women's smoking and marital status and the incidence of total stroke and ischemic stroke (a stroke caused by a blood clot blocking blood flow to the brain). Overall, 2,347 of the women were current or former smokers themselves. Of those women, 1,904 were married to smokers.

"We found that cigarette-smoking women with cigarette-smoking spouses had almost a six times higher relative risk of total stroke than cigarette-smoking women with nonsmoking spouses," he said.