Which factor does NOT contribute to dementia?

Regular exercise is recognized for its numerous benefits on overall health and is often associated with a reduced risk of numerous chronic conditions, including cognitive decline and dementia. Engaging in physical activity is linked to improved circulation, better mood regulation, and enhanced brain health. It promotes neuroplasticity, which is the brain's ability to adapt and form new connections, thus potentially offsetting the onset or progression of dementia-related symptoms.

In contrast, genetic factors, tobacco use, and vascular diseases are well-documented contributors to the increased risk of developing dementia. Genetic predispositions can influence the likelihood of conditions such as Alzheimer’s disease, while tobacco use is known to harm cardiovascular health and negatively impact the brain. Vascular diseases also compromise blood flow to the brain, which can lead to cognitive impairments and increase the likelihood of dementia development. Therefore, while genetics, tobacco use, and vascular disease are risk factors, regular exercise is protective against dementia, making it the correct choice for the factor that does not contribute to dementia.