Can Smoking Cause Infertility?

oh ok my question will i have difficulty in getting pregnancy.. because some times i smoke thats y.. n my friend told it wil creat problem thats y thought to ask u .. my age is 21 iam a sports in cricket so just to clarefy i asked anyway thanks a lot .. one more question for u.. one of my friend her age is now 35 she is saffering lot from migrain problem for that she is taking nice tablet when ever she get that pain she use to take that tablet n the pain also reduse but wats my doubt is wil she get problem when she take this tablet all times because people wil say more tablet is not good for health thats y.. n specially in this summer she feels very difficult.. can u say any idea to cure this plzzz..