Smoking may be a risk factor for dementia among the elderly that erodes their problem-solving capacity and self-control and makes them see things which are not there. Severine Sabia University College London and colleagues based their findings on the Whitehall II cohort study involving British Civil Service employees. They examined the link between smoking and cognitive decline in the transition from midlife to old age. They obtained data from 5099 men and 2137 women with average age of 56 years at the first cognitive assessment the Archives of General Psychiatry reports. The authors note their analysis presents four key findings.