Smokers are more likely to develop Alzheimer's disease and other forms of dementia than people who have quit or have never smoked, Dutch researchers have found.

People who smoke were 50 percent more likely to develop dementia than similar non-smokers, according to the study, News.com.au reported.

For the study, Monique Breteler of Erasmus Medical Centre in Rotterdam and her colleagues followed nearly 7,000 people ages 55 and older for an average of seven years, according to the findings published in the journal Neurology.

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Over that time, 706 people participating in the research developed dementia.

Although there is a well-known gene that raises the risk of dementia called APOE4 or apolipoprotein E4, smoking did not affect the Alzheimer's risk for people who had that gene.