Pnigophobia
Pnigophobia or Pnigerophobia, is a fear of choking or being smothered!  This phobia can include choking on food, such as fish bones, or smoking.  A person with this fear might avoid smoky places or people who smoke.  They also might try to avoid wrapping up in heavy quilts and going outside on humid days because this can cause a labored breathing.  Symptoms could include shaking or increased heart rate when around something that might cause you to choke or be smothered.