Conjunctivitis, vitreous clouding, glaucoma, dry eye and other causes. 1. Conjunctivitis: Conjunctivitis will increase the secretion of the eye, if not cleaned up in time, may lead to excessive secretion of excrement in the eye, obstructing the line of sight, causing the phenomenon of smoke floating in the eye to see things. 2. Vitreous clouding: Vitreous clouding can cause the manifestation of seeing things with smoke floating, need to be alert to retinal detachment, vitreous hemorrhage. 3. Glaucoma: Glaucoma will increase the intraocular pressure, in the early stage, there may be a layer of fog in the eyes, vision loss, eye swelling and other symptoms. 4. Dry eye: If you use your eyes excessively by looking at cell phones and computers for a long time, so that your eyes don’t have enough rest, it is easy to cause dry eye, which leads to blurred vision and is accompanied by itching in both eyes, foreign body sensation, and fluctuation of vision. If you have smoke floating in your eyes, you should go to the hospital in time, and give appropriate treatment under the guidance of the doctor after clarifying the cause of the disease, so as to avoid delaying the condition.