Marijuana is the most commonly used federally illegal drug in the United States, with an estimated 48.2 million people using it in 2019.7 Marijuana use may have a wide range of health effects on the body and brain, including a direct effect on brain function, scarring and damage to small blood vessels, increased heart rate and blood pressure, an increased risk of using other drugs and more.
The percentage of adolescents in 2015 who were current marijuana users was similar to the percentages in most years between 2004 and 20148
Daily marijuana use among college students has increased in recent years, rising from 3.5% in 2007 to 4.6% in 20158
Since 2003, 19- to 22-year-olds seeing regular marijuana use as dangerous to the user has declined sharply, from 58% in 2003 to 33% by 20158
A recent study revealed up to 40% of pregnant women age 24 and younger screened positive for marijuana use, despite only 20% self-reporting use of marijuana14