I think most of us know it is a good idea to restrict as many chemicals from entering our bodies when trying to get pregnant. However, what you may not know is this applies as much to men as women, as evidenced in this article about the damage that mariguana can cause to sperm.
http://www.aphroditewomenshealth.com/news/
20050931234754_health_news.shtml
http://www.aphroditewomenshealth.com/news/
20050931234754_health_news.shtml