U.S. Surgeon Jerome Adams, MD, MPH, on August 29 issued an advisory against marijuana use by adolescents and pregnant women. “No amount of marijuana use during pregnancy or adolescence is known to be safe,” the advisory states.

The advisory cites statements from the American College of Obstetricians and Gynecologists and the American Academy of Pediatrics, as well as numerous studies. It also notes that the potency of marijuana today is much stronger, with the THC concentration in commonly cultivated marijuana plants having increased three-fold between 1995 and 2014.

“Recent increases in access to marijuana and in its potency, along with misperceptions of safety of marijuana endanger our most precious resource, our nation’s youth,” the advisory stated.

Read the full advisory.

See the August 29 news conference with Surgeon General Dr. Adams and Secretary of Health & Human Services Alex Azar.