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Smoking more than one pack of cigarettes each day greatly increases the risk of losing the ability to distinguish colors from different shades, reveals a new study.
A group of researchers from Rutgers University in the United States examined 71 healthy people who had smoked less than 15 cigarettes in their entire lives and 63 people who smoked at least 20 cigarettes a day and absolutely did not want to stop to smoke, according to the study published in the journal Psychiatry Research.
The participants in the study were 25 to 45 years old and had normal or corrected vision.
The researchers found that the ability of smokers to distinguish between contrast and color was remarkably lower compared to non-smokers, while their ability to see the red-green and blue-yellow colors had changed considerably.
The study also found that nicotine in cigarettes, a neurotoxic chemical, was responsible for vision loss, damaging blood vessels and retinal neurons.
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