“…In women who are attempting to quit smoking, menstrual phase, perhaps via sex hormones (specifically progesterone and estradiol), appears to be associated with risk for smoking relapse (Allen, Bade, Center, Finstad, & Hatsukami, 2008;Allen S.S, Allen A.M, Lunos, & Hatsukami, 2009b;Carpenter, Saladin, Leinbach, Larowe, & Upadhyaya, 2008;Franklin et al, 2008;Mazure, Toll, McKee, Wu, & O'Malley, 2011). Women who attempted to quit smoking during the luteal phase (the last 14 days of the menstrual cycle with relatively high levels of progesterone and low levels of estrogen) had improved smoking cessation outcomes compared with those who quit during the early follicular phase (begins after menses with relatively low levels of both progesterone and estrogen) in the absence of nicotine replacement therapy (NRT) (Allen et al, 2008;Allen et al, 2009b;Mazure et al, 2011).…”