Trends in Secondhand Smoke Exposure, 2011−2018: Impact and Implications of Expanding Serum Cotinine Range was recently pubished in the American Journal of Preventive Medicine
This study assessed the impact of defining secondhand smoke (SHS) exposure among nonsmokers using an expanded serum cotinine range among a nationally representative sample of U.S. nonsmokers aged 3 years or older. This study found that expanding the serum cotinine range from 0.05–10 ng/mL to 0.015- 10 ng/mL more than doubles the estimated proportion of U.S. nonsmokers exposed to SHS. In contrast to a serum cotinine range of 0.05–10 ng/mL, a cotinine range of 0.015–10 ng/mL suggests that progress has been made in reducing population-level SHS exposure during 2011–2018, especially among nonsmokers experiencing lower exposure levels. Additional research will be important to help inform potential future modifications to the currently established definition of 0.05-10 mg/mL to best inform public health policy, planning, and practice.