hi prolonged drug use can affect egg production and maturation affecting fertility levels. the chances of successful pregnancy depend on many factors (ovarian uterine hormonal stress etc). you should consider getting a complete infertility work-up done for partner to see if there are any underlying causes for the infertility/inability to conceive. do hope this helps both of you. good luck
could my girlfriend be infertile. we have been trying for 8 months. she believes shes incapable of conceiving. no one in her family is infertile. on average we have vaginal sexual intercourse about 3-5 times a week. . the year prior we dated she would use drugs such as marijuana r2s (pills) cocaine and heroine (never injected). i don't know if she was a heavy or light user. she drinks/smokes at our family/friends gatherings about 5-8 beers and cigarettes. i was thinking of using the placebo method. she also has vaginitis.