Secondhand Smoke Tied to Raised Stroke Risk in Study
Jul-16-2015

New research suggests that exposure to secondhand smoke may increase nonsmokers' risk of stroke by nearly one-third.

"Our findings suggest the possibility for adverse health outcomes such as stroke among nonsmokers exposed to secondhand smoke and add to the body of evidence supporting stricter smoking regulations," said lead author Angela Malek, of the Medical University of South Carolina in Charleston.

Researchers analyzed data from nearly 22,000 white and black American adults older than 45. About 23 percent said they were exposed to secondhand smoke in the previous year.

Between April 2003 and March 2012, there were 428 strokes among the study participants. There were 352 ischemic strokes (blockage of blood flow to the brain), 50 bleeding (hemorrhagic) strokes, and 26 strokes of unknown subtype.

After adjusting for other stroke risk factors - such as diabetes, high blood pressure and heart disease - the researchers found that exposure to secondhand smoke was linked to about a 30 percent increase in nonsmokers' risk of stroke.

However, the association seen in the study does not prove a cause-and-effect relationship.

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