The Trump Administration is pushing hard against pregnant mothers smoking weed, with the Department of Health and Human services issuing a new advisory against the practice.

Surgeon General Jerome Adams held a press conference on Thursday, in which he tried to put a fright in people by saying, “While the perceived harm of marijuana is decreasing, the scary truth is that the actual potential for harm is increasing.”

What he means is that even though more people tolerate cannabis than they used to, and most Americans are now in favor of legalizing the drug, THC levels also are higher than they used to be, and so it could potentially have more harmful effects .

“This ain’t your mother’s marijuana,” the surgeon general told NPR. “The higher the THC delivery, the higher the risk.”

While they didn’t actually present much science showing any ill effects of cannabis on fetuses, Adams pointed to studies which he says show that adolescents who regularly use weed are “more likely to show a decline in IQ.” He also said, “Nearly 1 in 5 people who begin marijuana use during adolescence become addicted.”

Adams’s new advisory is apparently part of a wider effort to curb marijuana use in he U.S. Health and Human Services Secretary Alex Azar has announced that President Trump will donate $100,000 of his salary for that most important of causes, to fund a media campaign about the dangers of using cannabis.

Some have criticized the Surgeon General announcement, with Rolling Stone pointing out that similar guidelines regarding the use of alcohol while pregnant disproportionately affect economically disadvantaged women and women of color. In addition, a 2017 study found that 14% of women said that mandatory drug testing would deter them from seeking prenatal care.Photo via Flickr user Altus Geldenhuys