In 2008, for the first time in nearly 30 years, more people died of poisoning than in car crashes. Poisoning is now the leading cause of injury death, and 90 percent of poisonings were caused by drugs.

An analysis published last week by the National Center for Health Statistics found that opioid painkillers like morphine, hydrocodone (sold as Vicodin and other brands) and oxycodone (Percocet and other brands) were involved in more than 40 percent of drug poisonings in 2008. These drugs were implicated in more poisoning deaths than heroin or cocaine.

Opioid analgesics accounted for 14,800 of the 36,500 fatal drug poisonings in 2008. About 12,400 people died after taking other kinds of drugs, and for 25 percent of the cases where drugs were listed as a cause of death, no specific drug was mentioned.

There were considerable variations in rates of drug poisoning by age. The rate was highest among 45- to 54-year-olds, and people under 24 had the lowest rates of any group except those over age 65.