Abuse of painkillers continues to be a problem among teenagers, although fewer of them are smoking cigarettes or taking stimulants, according to a recent survey conducted by scientists at the University of Michigan.

For the current report, the researchers polled 46,348 students about their own drug habits and their attitudes toward the drugs popular among teens today.

The report, titled “Monitoring the Future: National Results on Adolescent Drug Use,” found that nearly 10% of high school seniors reported nonmedical  use of Vicodin and 4.7% reported abusing OxyContin. Both drugs are opioid painkillers. The list of preferred drugs also included prescription drugs or over-the-counter medicines such as cough syrup, the report noted.

The survey also found that marijuana use has leveled off after a decade-long decline. In the past year, 10.9 percent of eighth graders, 23.9 percent of 10th graders, and 32.4 percent of 12th graders reported using marijuana, the researchers found. Cigarette smoking among teens is at its lowest rate ever, the report found. Alcohol use among teenagers continues to decline; the survey has shown a significant drop among 10th-graders for all categories of alcohol use.

The use of some stimulants – amphetamines, methamphetamine, crystal methamphetamine, cocaine and crack – continued a gradual decline. The report found a decrease in the rates of adolescent substance abuse for almost every type of illegal drug, including marijuana, cocaine, LSD, Ecstasy as well as prescription drugs. An illegal drug is described as marijuana, hashish, cocaine, heroin, hallucinogens, inhalants, and prescription drugs that are not used for medical purposes.