Malia Obama has been accused of smoking marijuana after a video of her puffing on a suspicious cigarette was released.
The president's eldest daughter was seen inhaling from the cigarette during the Lollapalooza music festival in Chicago.
The brief clip, published by Radar on Thursday, shows the 18-year-old mingling with crowds as she takes a drag.
An eyewitness insisted she was smoking marijuana, the tabloid site reported
The teenager has suffered from asthma.
Marijuana was recently decriminalised in Illinois - the state where she allegedly smoked.
Decriminalisation means smoking marijuana is still illegal, but the punishment and penalties are lenient.
The footage was unveiled after photos of the Harvard-bound high school graduate twerking were shared on social media.
Malia, who was wearing a midriff-baring tube top and pair of cutoff jean shorts, even posed for a few photos while she danced.
She was also spotted dancing up a storm with her friends on Thursday night, catching a performance from Norwegian DJ Cashmere Cat.
It was around the same time Hillary Clinton was preparing to take the stage and accept her party's nomination for president in a historic moment for the country.
Her presence was not required at the Democratic National Convention for the first time since her father became the Democratic nominee back in 2008.
So the recent high school graduate seemed to take full advantage of this by skipping out on the scene in Philadelphia to head to Chicago.
This is not Malia's first trip to Lollapalooza, having been spotted at the festival back in 2014 as she took in Chance the Rapper's set.
Malia had an asthma attack when she was a toddler, which President Obama claims is one of the reasons why he champions climate change.
In an interview with ABC News' chief health correspondent, Dr. Richard Besser, in April 2015, he said: "Well you know, Malia had asthma when she was four, and because we had good health insurance, we were able to knock it out early.
The president said he can "relate to... the fear a parent has when your four-year-old daughter comes up to you and says, "Daddy, I'm having trouble breathing.'"
"The fright you feel is terrible."
Obama said the health scare resulted in a single trip to the emergency room for his daughter.
He said she now leads an active lifestyle without an inhaler.
The president has admitted to smoking marijuana in the past. He said he had used "a little blow" in high school and college.
He even made a joke about it at this year's White House Correspondent's Dinner
"The last time I was that high, I was trying to decide my major," he said.