(CNN) A new study, funded in part by the federal government, suggests alcohol has a more extreme impact on drivers than marijuana.

Researchers said alcohol "significantly increased lane departures/minimum and maximum lateral acceleration; these measures were not sensitive to cannabis." Researchers also concluded Cannabis-influenced drivers "may attempt to drive more cautiously to compensate for impairing effects, whereas alcohol-influenced drivers often underestimate their impairment and take more risk."

The National Institute on Drug Abuse, the Office on National Drug Control Policy, and federal safety regulator, the National Highway Traffic Safety Administration funded the study.

The National Institute on Drug Abus says it used the "most sophisticated driving simulator of its kind to mirror real-life situations."

JUST WATCHED Attorney General Holder Talks Marijuana Replay More Videos ... MUST WATCH Attorney General Holder Talks Marijuana 00:50

The participants drank alcohol to reach approximately 0.065% peak breath alcohol concentration, inhaled vaporized marijuana or had a placebo.

Read More