Thick - the disease; rare - the welfare.
Mist can symbolize spiritual initiation, a passage through an area where we cannot perceive things properly. Mist in a dream can indicate a transition state, a way from one state of awareness to another, and will often manifest to signify this. Mist is a symbol of loss and confusion particularly when it comes to emotions so when this image appears we may need to sit down and reconsider our actions, and how they may affect us, or indeed others in waking life. In waking life, many states of confusion can arise. Swirling mist in a dream may signify that the confusion arises from others. To be moving through stationary mist suggests that we are capable of reaching our goal provided we take into account our own confusion.
To dream that you are enveloped in a mist, denotes uncertain fortunes and domestic unhappiness. If the mist clears away, your troubles will be of short duration. To see others in a mist, you will profit by the misfortune of others.