Bieber forces pilots on to oxygen masks with mile-high hotbox

Justin Bieber's private jet was so thick with marijuana smoke, the pilots had to wear oxygen masks.

The 'Believe' singer, his father Jeremy Bieber, and an entourage of 10 flew from Canada to New Jersey last Friday and ignored warnings to stop smoking the narcotic, with flight staff forced to take drastic action as inhaling the smoke would have led to them failing drug tests, NBC News reports.