New AAA Foundation research shows an estimated 14.8 million Americans report driving within one hour after using marijuana in the past 30 days

An alarming finding shows that an estimated 14.8 million drivers report getting behind the wheel within one hour after using marijuana in the past 30 days. The impairing effects of marijuana are usually experienced within the first one to four hours after using the drug.1 And marijuana users who drive high are up to twice as likely to be involved in a crash.2