“…In women attempting spontaneous conception, cigarette smoking increased time to pregnancy (9) and accelerated depletion of ovarian follicles, causing early menopause (10)(11)(12). In infertile women undergoing IVF treatments, smoking resulted in decreased numbers of mature oocytes (13,14), fertilization rate (15), and implantations (16,17). Although it is recognized that cigarette smoking can affect almost every step in reproductive physiology, the mechanisms underlying its adverse effects are not clearly defined.…”