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Justin Bieber and his entourage smoked so much marijuana on his private jet to the Super Bowl, pilots were forced to strap on oxygen masks so the “Cheech and Chong”-style hotbox wouldn’t get them high, authorities said.

The airplane captain warned the pothead pop star and his father, Jeremy Bieber, 38, several times to stop smoking weed — which produced a cloud of smoke so thick that pilots feared they would fail a drug test simply from breathing, NBC reports.

But instead of putting down his lighter, Bieber and his dad lashed out at a flight attendant in an “extremely abusive” rant, forcing her to hide near the cockpit during the Jan. 31 flight from Canada to Teterboro Airport in New Jersey, sources said.

“The captain of the flight stated that he warned the passengers, including Bieber, on several occasions to stop smoking marijuana,” authorities wrote in an incident report. “The captain also stated he needed to request that the passengers stop their harassing behavior toward the flight attendant and, after several warnings, asked the flight attendant to stay with him near the cockpit to avoid any further abuse,” the report notes.

Biebs, 19, who was traveling with a 10-man posse, admitted to DEA agents after landing that he was drunk and high but not carrying drugs, sources said.

The luxury aircraft, which was decked out in leather seats, reeked of weed, authorities said. Drug-sniffing dogs signaled that marijuana was in the star’s bag — but officers could find none of the illicit green stuff.

Port Authority cops and Customs officials later found marijuana stems in the jet but didn’t press charges due to a “chain of evidence issues,” law enforcement sources said.

The flight attendant won’t press charges either, but she refuses to fly with the singing stoner ever again, sources said.

“The flight attendant stated the passengers, including Bieber and his father, Jeremy Bieber, were extremely abusive verbally and she would not work another flight with them,” according to the report.