President Obama is “furious” with daughter Malia for puffing on what appeared to be a marijuana cigarette, according to a report.

“This is the president’s worst nightmare!” said a source, who told RadarOnline that the commander in chief took executive action, confronting his daughter about her alleged antics during the family’s summer vacation. “The end of his term is in sight — and the carefully crafted image of a world-beating family is unraveling right before his eyes!”

Video first emerged of Malia Obama, 18, appearing to puff on ganja at the Lollapalooza festival in Chicago last month.

Then, a “rowdy” party Malia attended on the island where her family is vacation — Martha’s Vineyard — was busted up by local cops.

“I’m sure he had some choice words for his daughter during that walk they took,” the source said, referring to a private walk the president and Malia took on Martha’s Vineyard following the publication of the footage.

Malia graduated this year from the exclusive private school Sidwell Friends in Washington, DC, and after a planned year off, intends to begin at Harvard in 2017.

Meanwhile, sister Sasha Obama, 15, has been toiling away at a Martha’s Vineyard fish restaurant, busing tables and prepping for the lunch rush.