Variation in Nicotine Intake Among U.S. Cigarette Smokers During the Past 25 Years: Evidence From NHANES Surveys

Nicotine Tob Res. 2014 Dec;16(12):1620-8. doi: 10.1093/ntr/ntu120. Epub 2014 Jul 25.

Abstract

Objective: To estimate changes in nicotine intakes among U.S. cigarette smokers from 1988 to 2012 with the National Health and Nutrition Examination Survey (NHANES).

Methods: NHANES provides data on nationally representative samples of cigarette smokers from the civilian noninstitutionalized U.S. population. A total of 4,304 smokers aged 20 years and older were studied in NHANES III 1988-1994 and 7,095 were studied in the continuous NHANES 1999-2012. We examined serum cotinine concentrations, daily cigarette consumption, and estimated nicotine intake per cigarette, with adjustment for sex, age, racial/ethnic background, level of education, and body mass index.

Results: There was little overall change in nicotine intake from smoking cigarettes either in the U.S. population as a whole or in major racial/ethnic subgroups during the 25-year period from 1988. Serum cotinine averaged 223.7ng/mL (95% confidence interval [CI] = 216.1-231.3) in 1988-1994, which was not significantly different from the adjusted mean of 219.2ng/mL (95% CI = 214.1-224.4) in 1999-2012. During the same period, average daily cigarette consumption declined substantially, from 17.3 (95% CI = 16.5-18.0) in 1988-1994 to 12.3 (95% CI = 11.0-13.6) by 2012. Cotinine per cigarette smoked increased by some 42% between 1988-1994 and 2011-2012, from a geometric mean of 12.4 (95% CI = 11.7-13.1) to 17.6 (95% CI = 16.1-19.2).

Conclusions: Reductions in cigarette smoking prevalence since the late 1980s, changes in cigarette product design, and the widespread introduction of smoke-free policies have not had a significant impact on nicotine intakes among U.S. smokers. Reductions in cigarette consumption have been offset by increased nicotine intake per cigarette smoked.

MeSH terms

  • Adult
  • Cotinine / blood
  • Female
  • Humans
  • Male
  • Middle Aged
  • Nicotine* / blood
  • Nutrition Surveys / trends*
  • Smoke-Free Policy / trends
  • Smoking / blood
  • Smoking / epidemiology*
  • Smoking / trends*
  • United States / epidemiology
  • Young Adult

Substances

  • Nicotine
  • Cotinine