Lungs 
To dream of seeing lungs represents insight, ingenuity, and encouragement. Alternatively, lungs may symbolize a bothersome incident and a feeling of suffocation in your current relationship or situation.
Throat
To dream of your throat represents your talents in relaying your beliefs to others.
To dream about having a sore throat indicates that you are not being articulate. You might be afraid to speak. More literally, it could mean that you should 'swallow your pride.'
To admire a slender, attractive throat in a dream signals some improvement in your lot in life.
Breath
If you are able to see your breath in a dream and it does not appear to be cold, consider what you are about to reveal in waking life. This doesn't mean disclose it verbally, it refers to something you will declare with your own actions or choices. Your subconscious mind is calling attention to what might come out of you before you've had the chance to divulge something.
If your breath is heavy or shallow, consider what kind of air you've been taking in and what type of people you have been surrounding yourself with.
Having trouble with your breath is a symbol of stale air, ideas, people, or situations.
Coughing
To dream that you are coughing implies that you are anxious or apprehensive about upcoming events. Perhaps you should spend some time away from certain people or situations. It may also imply that you have incorrectly made a decision that hasn't had positive influences on you or those around you.
Gas Mask
To see or wear a gas mask in your dream indicates the need to practice filtering the information you take to heart.
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