A 20-year longitudinal study conducted by scientists at the University of Bergen in Norway has found that using cleaning products can be as harmful as smoking 20 cigarettes a day.

The European Community Respiratory Health Survey aimed to find out more about the long-term effects of using cleaning products. The study looked at lung function in 6,230 participants in 22 locations around the world. Participants answered questions about how often they used cleaning products and had their lung function measured.

CC BY-SA 3.0 Nick Youngson / Alpha Stock Images

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