“…Clinical research examining the influence of hormones on addiction processes is generally supportive of the animal literature ( Becker et al., 2017 ; Fattore et al., 2008 ; Wetherill et al., 2016 ). Research has shown that exogenously administered P decreases the positive subjective effects of combustible cigarette smoking and associated craving ( Sofuoglu et al., 2001 ), reduces smoking intensity as measured by puff volume ( Harrison et al., 2020 ), and higher within-person P levels predict reductions in the number of cigarettes smoked per day ( Baker et al., 2020 ). These studies and others ( DeVito et al., 2014 ; Mello, 2010 ; Schiller et al., 2012 ) suggest that P, of which levels are greatest relative to E during the mid-luteal phase of the menstrual cycle, may offer some protection over drug-seeking behavior and drug use.…”