According to researchers at King's College London, smoking can "rot" the brain by damaging learning, reasoning and memory.
According to BBC, 8,800 people over 50 took part in the study, which revealed that smoking may affect the brain, but only to a lesser extent.
Scientists who were involved in the study said that people should be aware that lifestyles may actually damage the brain, as well as the body.
According to the IBITimes, the study, which was published in the Journal Age and Ageing, also revealed that people who were older than 50, and had high blood pressure, were at the highest risk of suffering a stroke.
The group also did not perform well on cognitive tasks that tested verbal fluency, attention and memory recall.
According to Gawker, the study was meant to investigate the link between stroke or heart attack and the well-being of the brain.
An Alzheimer's Society spokesperson said that everybody knows that smoking, high cholesterol levels and high blood pressure is bad for the heart. The spokesperson went onto say that the research just adds to the evidence that suggests that smoking may be bad for people's brains too.