Nigella Lawson`s recent US flight ban blamed on ex- hubby Charles Saatchi

London: Nigella Lawson`s close friends believe that her ex-husband Charles Saatchi was behind her ban from the US.Reportedly faced humiliation when she was recently stopped from boarding the British Airways flight following her courtroom admission that she had snorted Class A drug cocaine. A source close to Lawson revealed that her friends were absolutely convinced that there was something more to this, as she had said numerous times earlier that she believed that her ex- hubby Charles Saatchi was out to ruin her. A source said after the ban that Saatchi was still at it and it was still going on.