In New Jersey, overdose is now the leading cause of accidental death. Almost 6,000 people have died from drug overdoses in New Jersey since 2004. More than 700 people died from drug overdoses in New Jersey in 2009 alone. Opioids were involved in more than 75 percent of drug overdose deaths in New Jersey in 2009. The five counties with the highest numbers of drug overdose deaths are Camden, Essex, Middlesex, Monmouth and Ocean.