Women who regularly clean could be at risk of a long-term health issue. Research has shown that exposure to cleaning chemicals could result in a greater decline in lung function. The study also found that the effect of 10 to 20 years of cleaning on the lungs was comparable to 10 to 20 years of smoking a pack of cigarettes every day. As part of the study, researchers at the University of Bergen in Norway analysed data from 6,235 participants. They followed these participants, whose average age