Workers exposed over years to formaldehyde may experience thinking and memory problems later in life, researchers at the University of Montpellier, in France, have concluded. Their study published in the journal Neurology surveyed and tested more than 75,000 people with an average age of 58. Of those, 8 percent were exposed to formaldehyde through their occupations as nurses; caregivers; medical technicians; workers in the textile, chemistry and metal industries; carpenters and cleaners. The risk of developing thinking and memory problems was an average of 17 percent higher in people that were exposed to formaldehyde on the job than those with no such exposure. People exposed to formaldehyde for 22 years or longer had a 21 percent higher risk of cognitive impairment.