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Heavy Smoking Linked to Alzheimer's in Study
Date:10/25/2010

By Steven Reinberg
HealthDay Reporter

MONDAY, Oct. 25 (HealthDay News) -- Heavy smoking in middle age seems to increase the risk for developing Alzheimer's disease or another dementia, a large new study suggests.

"We found that people who reported heavy smoking in midlife had more than a 100 percent increase in risk of Alzheimer's disease and vascular dementia," said lead researcher Rachel A. Whitmer, a research scientist in Kaiser Permanente's Division of Research in Oakland, Calif.

"We have known that smoking is a risk factor for cancer, stroke and cardiovascular disease," she said. "This adds to the evidence that what is bad for the heart is bad for the brain."

The report is published in the Oct. 25 online edition of the Archives of Internal Medicine.

For the study, Whitmer's group collected data on 21,123 ethnically diverse people in the Kaiser Permanente health care system who were surveyed between 1978 and 1985, when they were 50 to 60 years old.

During an average follow-up of 23 years, the researchers found that 25.4 percent were diagnosed with dementia, including Alzheimer's (1,136 people) or vascular dementia (416 people), which is the second most common form of dementia after Alzheimer's disease. Vascular dementia is caused by damage to the arteries in the brain.

Compared with non-smokers, those who smoked more than two packs of cigarettes a day in midlife had a "dramatic increase" in the incidence of dementia -- more than a 157 percent increased risk of developing Alzheimer's disease and a 172 percent increased risk of developing vascular dementia, Whitmer's team found.

Former smokers and people who smoked less than half a pack a day did not appear to be at increased risk of Alzheimer's or vascular dementia, the researchers note.

The associations between smoking and dementia did not change even after adjusting for race or gender, high blood pressure, high chole
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