Studies examining the association between menstrual cycle phases and smoking behavior in women have yielded mixed results. The purpose of this study was to elucidate the associations between ovarian hormones and smoking by directly measuring ovarian hormone levels and obtaining a laboratory assessment of smoking behaviors. Four hypotheses were tested: increased smoking will be associated with 1) low absolute levels of estradiol and progesterone; 2) decreasing (i.e., dynamic changes in) estradiol and progesterone; 3) lower ratios of progesterone to estradiol, and 4) higher ratios of estradiol to progesterone. Female smokers (≥10 cigarettes/day) with regular menstrual cycles were recruited as part of a larger, ongoing study examining the influence of ovarian hormones on smoking cessation treatment. Participants completed two study visits, including a one-hour adlib smoking topography session, which provided a detailed assessment of smoking behavior. Both the change in hormone levels over time and the relative ratios of ovarian hormones were associated with smoking behavior, but each to a limited extent. Decreases in estradiol (r=−.21, p=.048), and decreases in progesterone (r=−.23, p=.03) were associated with increased puff intensity. Lower ratios of progesterone to estradiol were associated with a greater number of puffs (r=−.26, p=.01) and weight of cigarettes smoked (r=−.29, p=.005). The best predictors of smoking behavior were the ratio of progesterone to estradiol (z=−2.7, p=. 004) and the change in estradiol and progesterone over time (z=−2.1, p=.02). This pattern of results may help to explain inconsistent findings in previous studies and suggest potential mechanisms by which hormones influence nicotine addiction.
KeywordsEstrogen; progesterone; nicotine; tobacco; women Smoking is the leading cause of preventable death in the United States (Danaei et al., 2009). Although men are more likely to smoke than women (USDHS, 2010), women may be more sensitive to certain aspects of nicotine addition. For example, women are more sensitive to * Corresponding author. University of North Carolina at Chapel Hill, Department of Psychiatry, CB#7175, Chapel Hill, NC 27599. Phone: (919) 843-2482 Fax: (919) 966-0708 crystal_schiller@med.unc.edu. Drs. Saladin, Gray, Carpenter, and Hartwell designed the study and wrote the protocol. Dr. Schiller conducted literature searches, provided summaries of previous research studies, and conducted the statistical analysis. Dr. Schiller wrote the first draft of the manuscript, and all authors contributed to and have approved the final manuscript.The authors declare that they have no additional conflicts of interest. (Myers, Taylor, Moolchan, & Heishman, 2008;Sofuoglu, Mitchell, & Mooney, 2009) and more likely to cite tension reduction, stimulation, social dynamics (Berlin et al., 2003), and appetite suppression as reasons for smoking (Reid, Pipe, Riley, & Sorensen, 2009). Smoking is associated with significant health risks in women (Perkins, 2001), and more women than men r...