In a dream, vapor represents a symptom of cataract that makes one’s eye cloudy and obscures his sight. If during the summer one sees vapor exhaling from his mouth in a dream, which is a common phenomena in cold weather, it means an internal disease, or exposing one’s secrets. If the person in question in such a dream is a believer on the path, he may become heedless. If he is a man of knowledge, he may invent a provoking trend. On the other hand, vapor in a dream may imply falsehood, lies and idle talk, (Also see Clouds)
Read more about dreaming of Vapor in other dream meanings interpretations.