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According to the study's co-author Steven Silverstein, the study found that "excessive use of cigarettes, or chronic exposure to their compounds, affects visual discrimination, supporting the existence of overall deficits in visual processing with tobacco addiction." Silverstein continued, explaining just how harmful cigarette smoke can be to one's eyes

According to the CDC, tobacco kills more than half a million people in the U.S., and costs more than $300 billion per year

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This is a classic case of a nicotine delivery device, he said, so the FDA is looking at it to see if there is anything dangerous associated with its use