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However, Doug Speed and his colleagues have no explanation as to why smoking might lead to mental illness

Pirie K, Peto R, Reeves GK, Green J, Beral V
doi: 10.1093/toxsci/kfh083

Cystic Fibrosis: For children with cystic fibrosis, secondhand smoke can worsen respiratory symptoms and lead to more frequent pulmonary infections
