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Dr. Daniel Teitelbaum, at the Colorado School of Public Health, warns benzene exposure could be increased in workers who use hand sanitizer contaminated with it, then put on gloves that prevent evaporation. "If you're not wearing gloves over them, the risk is quite low because your skin is warm, you use that, the benzene will evaporate quite rapidly," he said, adding that threat mostly is for people with "special risks."