By Breaking Celebrity News Staff

Whitney Houston’s daughter, Bobbi Kristina Brown, is spiraling out of control after her mother’s tragic death, but drug use has been a problem for quite a while for the troubled teen.

A shocking new video shows Bobbi Kristina smoking marijuana from a three-foot-tall bong, inhaling the swirling pot smoke so deeply that she nearly collapses in a coughing fit!

The video was exclusively obtained by EnquirerPlus, the new iPad app that features content from the National Enquirer retooled for a younger audience. You can get one free issue of EnquirerPlus in the iTunes app store and find more information on the EnquirerPlus Web site. The Bobbi Kristina video first appeared on EnquirerPlus.

Whitney’s 19-year-old daughter was partying with friends who attend college in Statesboro, Georgia in March 2011 and in the disturbing video her knowledgeable use of the bong is evident.

In the video, Bobbi Kristina says: “Give me the lighter,” and then lights the bong, and after taking a long hit and coughing she takes another one!

“Bobbi Kristina was staying with friends at the school and she brought along a big bag of pot for the party,” a source at the party said about the night.

“The party was well underway by the time I got there around 11 p.m. When I left at 6am the next day, she was still partying hard.”

The source said Bobbi Kristina looked like she knew exactly what she was doing.

“Between tokes, Bobbi was drinking shots of Grey Goose and Skyy Blue vodka, and sipping a mixed vodka drink.

Watch the video on Breaking Celebrity News

“She’s obviously a seasoned partier.  With the amount of pot and alcohol she was using, I would have passed out, but she was still g