Childhood Exposure to Parental Smoking and Midlife Cognitive Function: The Young Finns Study

We studied whether exposure to parental smoking in childhood/adolescence is associated with midlife cognitive function, leveraging data from the Cardiovascular Risk in Young Finns Study. A population-based cohort of 3,596 children/adolescents aged 3–18 years was followed between 1980 and 2011. In 2011, cognitive testing was performed on 2,026 participants aged 34–49 years using computerized testing. Measures of secondhand smoke exposure in childhood/adolescence consisted of parental self-reports of smoking and participants’ serum cotinine levels. Participants were classified into 3 exposure groups: 1) no exposure (nonsmoking parents, cotinine