<unk>  is the mechanical obstruction of the flow of air from the environment into the lungs.<unk>  prevents breathing, and can be partial or complete, with partial<unk>  allowing some, 
although inadequate, flow of air into the lungs. Prolonged or complete<unk>  results in asphyxiation which leads to hypoxia and is potentially fatal.
Choking
Dipping tobacco
Hypnic jerk
Cough
Cough  
Mourning
Smoke inhalation
Wrinkle