All in the family - scientists discover gene for cocaine addiction - The Guardian 11th November 2008

It has become commonplace for people who are overweight to attribute their waistline to their DNA. Now, celebrities caught snorting cocaine might also be able to blame their parents. Scientists reported yesterday the discovery of a gene that increases the chances of becoming hooked on the drug. Addicts were 25% more likely to carry the gene variant than people who did not use cocaine, a study found.

Link to Article