Nasotracheal suctioning is used to clear the nose and throat - often in people with obstructive airway diseases or illnesses, but only by trained personnel.
Lung tissues are remote from the nose, sufficient suction to remove mucus would surely damage the lungs and airway.
Intubation through the nose and airway are used in emergencies to reinflate lungs or attach a respirator, and in some cases to suction out blood or excessive fluid, but these procedures are done by trained professionals.