Bobbi Kristina Brown Bong Video: Released, Shocking!

Whitney Houston’s daughter, Bobbi Kristina Brown, is seen hitting the bong HARD in a 2011 video posted by the National Enquirer on its new Enquirer Plus site.

The oft-troubled 19-year-old was partying with friends who attend college in Statesboro, Ga., in March of last year, when the bong video was taken.

The Enquirer video shows Bobbi Kristina smoking marijuana out a three-foot-tall bong, inhaling the smoke so deeply that she nearly collapses coughing.

In the video, Bobbi Kristina says, “Give me the lighter,” and then lights the bong, takes a huge hit, coughs and goes back for more ... like a boss.

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

“When I left at 6 a.m. the next day, she was still partying hard. Between tokes, Bobbi was drinking shots of Grey Goose and Skyy Blue vodka."

“She’s obviously a seasoned partier.  With the amount of pot and alcohol she was using, I would've passed out, but she was going strong.”

Having experimented with drugs and alcohol plenty as it is, Bobbi Kristina is said to be spiraling out of control after her mother’s tragic death this year.

Bobbi Kristina Brown was hospitalized twice in 12 hours after her mother died and was even rumored to be getting high after Whitney's funeral.

Friends and family members are very concerned about her future.

“Everyone is worried sick about Krissy ... her aunt Pat got a number of her friends and family to come to Atlanta and have a serious talk with her,” a source said.

“There were lots of tears, but Bobbi Kristina didn’t listen.”

Hopefully pseudo-stepbrother and maybe-fiance Nick Gordon and grandmother Cissy Houston can set her straight ... because Bobby Brown clearly can't.