Drink and drugs can damage men's sperm, study suggests - The Guardian 19th February 2008

Men should not smoke, drink or take unnecessary drugs if they are planning to become fathers to avoid causing health problems for their children, a health expert has warned. Scientists found that toxic chemicals can damage sperm, which then pass altered genes onto babies. In experiments on rats Matthew Anway of the University of Idaho found that some garden chemicals caused problems such as damaged and overgrown prostates, infertility and kidney problems, all of which were present up to four generations later.

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Men's smoking and drinking can damage the health of future children - Daily Mail 18th February 2008