Heavy smokers 'at increased risk of dementia'
Heavy smokers with a 40-a-day habit face a much higher risk of two common forms of dementia, a large study shows. The risk of Alzheimer's is more than doubled in people smoking at least two packs of cigarettes a day in their mid-life. The risk of vascular dementia, linked to problems in blood vessels supplying the brain, also rose significantly. The US study, looking at over 21,000 people's records, is published in the journal Archives of Internal Medicine.