According to a new study, smoking elevates the risk of Alzheimer’s disease and vascular dementia. A study of more than 20,000 men and women found a 157% heightened risk of Alzheimer’s disease in people who had smoked more than two packs of cigarettes a day. For vascular dementia, these smokers had a 172% increased risk. “Dementia is a disease that crops up in late life, and that becomes...