Islamic Interpretation
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 phenomenon 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)